diff --git a/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAAnnotCaret.java b/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAAnnotCaret.java
index 213f30b89..a11e75bb2 100644
--- a/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAAnnotCaret.java
+++ b/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAAnnotCaret.java
@@ -1355,18 +1355,6 @@ public COSObject getRD3Value() {
 		return entry3;
 	}
 
-	@Override
-	public Double getRD2NumberValue() {
-		COSObject RD2 = getRD2Value();
-		return getNumberValue(RD2);
-	}
-
-	@Override
-	public Double getRD3NumberValue() {
-		COSObject RD3 = getRD3Value();
-		return getNumberValue(RD3);
-	}
-
 	@Override
 	public Double getRD0NumberValue() {
 		COSObject RD0 = getRD0Value();
@@ -1379,6 +1367,18 @@ public Double getRD1NumberValue() {
 		return getNumberValue(RD1);
 	}
 
+	@Override
+	public Double getRD2NumberValue() {
+		COSObject RD2 = getRD2Value();
+		return getNumberValue(RD2);
+	}
+
+	@Override
+	public Double getRD3NumberValue() {
+		COSObject RD3 = getRD3Value();
+		return getNumberValue(RD3);
+	}
+
 	@Override
 	public Boolean getAPNHasTypeDictionary() {
 		COSObject APN = getAPNValue();
diff --git a/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAAnnotCircle.java b/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAAnnotCircle.java
index 26c3bd130..cf66063d0 100644
--- a/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAAnnotCircle.java
+++ b/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAAnnotCircle.java
@@ -1464,18 +1464,6 @@ public COSObject getRD3Value() {
 		return entry3;
 	}
 
-	@Override
-	public Double getRD2NumberValue() {
-		COSObject RD2 = getRD2Value();
-		return getNumberValue(RD2);
-	}
-
-	@Override
-	public Double getRD3NumberValue() {
-		COSObject RD3 = getRD3Value();
-		return getNumberValue(RD3);
-	}
-
 	@Override
 	public Double getRD0NumberValue() {
 		COSObject RD0 = getRD0Value();
@@ -1488,6 +1476,18 @@ public Double getRD1NumberValue() {
 		return getNumberValue(RD1);
 	}
 
+	@Override
+	public Double getRD2NumberValue() {
+		COSObject RD2 = getRD2Value();
+		return getNumberValue(RD2);
+	}
+
+	@Override
+	public Double getRD3NumberValue() {
+		COSObject RD3 = getRD3Value();
+		return getNumberValue(RD3);
+	}
+
 	@Override
 	public Boolean getAPNHasTypeDictionary() {
 		COSObject APN = getAPNValue();
diff --git a/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAAnnotFreeText.java b/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAAnnotFreeText.java
index 02d9990b9..fb2bacf53 100644
--- a/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAAnnotFreeText.java
+++ b/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAAnnotFreeText.java
@@ -1584,18 +1584,6 @@ public COSObject getRD3Value() {
 		return entry3;
 	}
 
-	@Override
-	public Double getRD2NumberValue() {
-		COSObject RD2 = getRD2Value();
-		return getNumberValue(RD2);
-	}
-
-	@Override
-	public Double getRD3NumberValue() {
-		COSObject RD3 = getRD3Value();
-		return getNumberValue(RD3);
-	}
-
 	@Override
 	public Double getRD0NumberValue() {
 		COSObject RD0 = getRD0Value();
@@ -1608,6 +1596,18 @@ public Double getRD1NumberValue() {
 		return getNumberValue(RD1);
 	}
 
+	@Override
+	public Double getRD2NumberValue() {
+		COSObject RD2 = getRD2Value();
+		return getNumberValue(RD2);
+	}
+
+	@Override
+	public Double getRD3NumberValue() {
+		COSObject RD3 = getRD3Value();
+		return getNumberValue(RD3);
+	}
+
 	@Override
 	public Boolean getAPNHasTypeDictionary() {
 		COSObject APN = getAPNValue();
diff --git a/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAAnnotSquare.java b/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAAnnotSquare.java
index 454ca9e5b..26c093c76 100644
--- a/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAAnnotSquare.java
+++ b/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAAnnotSquare.java
@@ -1460,18 +1460,6 @@ public COSObject getRD3Value() {
 		return entry3;
 	}
 
-	@Override
-	public Double getRD2NumberValue() {
-		COSObject RD2 = getRD2Value();
-		return getNumberValue(RD2);
-	}
-
-	@Override
-	public Double getRD3NumberValue() {
-		COSObject RD3 = getRD3Value();
-		return getNumberValue(RD3);
-	}
-
 	@Override
 	public Double getRD0NumberValue() {
 		COSObject RD0 = getRD0Value();
@@ -1484,6 +1472,18 @@ public Double getRD1NumberValue() {
 		return getNumberValue(RD1);
 	}
 
+	@Override
+	public Double getRD2NumberValue() {
+		COSObject RD2 = getRD2Value();
+		return getNumberValue(RD2);
+	}
+
+	@Override
+	public Double getRD3NumberValue() {
+		COSObject RD3 = getRD3Value();
+		return getNumberValue(RD3);
+	}
+
 	@Override
 	public Boolean getAPNHasTypeDictionary() {
 		COSObject APN = getAPNValue();
diff --git a/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAArrayOfNamesForEnforceEntry.java b/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAArrayOfNamesForEnforceEntry.java
index 8fc6d1f87..dcbcc81bd 100644
--- a/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAArrayOfNamesForEnforceEntry.java
+++ b/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAArrayOfNamesForEnforceEntry.java
@@ -40,6 +40,9 @@ public String getNameValue() {
 
 	@Override
 	public String getparentPrintScalingNameValue() {
+		if (this.parentObject == null || !this.parentObject.getType().isDictionaryBased()) {
+			return null;
+		}
 		return new GFAViewerPreferences(this.parentObject.getDirectBase(), null, null).getPrintScalingNameValue();
 	}
 
diff --git a/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAAuthCode.java b/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAAuthCode.java
index f3fa20863..47c56fe27 100644
--- a/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAAuthCode.java
+++ b/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAAuthCode.java
@@ -189,50 +189,98 @@ public Boolean getSigObjRefHasTypeDictionary() {
 	}
 
 	@Override
-	public Long getByteRange1IntegerValue() {
+	public Long getByteRange0IntegerValue() {
 		COSObject ByteRange = getByteRangeValue();
-		return new GFAArrayOf_4Integers(ByteRange.getDirectBase(), null, null).getentry1IntegerValue();
+		if (ByteRange == null || ByteRange.getType() != COSObjType.COS_ARRAY) {
+			return null;
+		}
+		if (ByteRange.size() <= 0) {
+			return null;
+		}
+		return new GFAArrayOf_4Integers(ByteRange.getDirectBase(), null, null).getentry0IntegerValue();
 	}
 
 	@Override
-	public Long getByteRange2IntegerValue() {
+	public Long getByteRange1IntegerValue() {
 		COSObject ByteRange = getByteRangeValue();
-		return new GFAArrayOf_4Integers(ByteRange.getDirectBase(), null, null).getentry2IntegerValue();
+		if (ByteRange == null || ByteRange.getType() != COSObjType.COS_ARRAY) {
+			return null;
+		}
+		if (ByteRange.size() <= 1) {
+			return null;
+		}
+		return new GFAArrayOf_4Integers(ByteRange.getDirectBase(), null, null).getentry1IntegerValue();
 	}
 
 	@Override
-	public Long getByteRange0IntegerValue() {
+	public Long getByteRange2IntegerValue() {
 		COSObject ByteRange = getByteRangeValue();
-		return new GFAArrayOf_4Integers(ByteRange.getDirectBase(), null, null).getentry0IntegerValue();
+		if (ByteRange == null || ByteRange.getType() != COSObjType.COS_ARRAY) {
+			return null;
+		}
+		if (ByteRange.size() <= 2) {
+			return null;
+		}
+		return new GFAArrayOf_4Integers(ByteRange.getDirectBase(), null, null).getentry2IntegerValue();
 	}
 
 	@Override
 	public Long getByteRange3IntegerValue() {
 		COSObject ByteRange = getByteRangeValue();
+		if (ByteRange == null || ByteRange.getType() != COSObjType.COS_ARRAY) {
+			return null;
+		}
+		if (ByteRange.size() <= 3) {
+			return null;
+		}
 		return new GFAArrayOf_4Integers(ByteRange.getDirectBase(), null, null).getentry3IntegerValue();
 	}
 
 	@Override
 	public Boolean getByteRange1HasTypeInteger() {
 		COSObject ByteRange = getByteRangeValue();
+		if (ByteRange == null || ByteRange.getType() != COSObjType.COS_ARRAY) {
+			return null;
+		}
+		if (ByteRange.size() <= 1) {
+			return null;
+		}
 		return new GFAArrayOf_4Integers(ByteRange.getDirectBase(), null, null).getentry1HasTypeInteger();
 	}
 
 	@Override
 	public Boolean getByteRange2HasTypeInteger() {
 		COSObject ByteRange = getByteRangeValue();
+		if (ByteRange == null || ByteRange.getType() != COSObjType.COS_ARRAY) {
+			return null;
+		}
+		if (ByteRange.size() <= 2) {
+			return null;
+		}
 		return new GFAArrayOf_4Integers(ByteRange.getDirectBase(), null, null).getentry2HasTypeInteger();
 	}
 
 	@Override
 	public Boolean getByteRange0HasTypeInteger() {
 		COSObject ByteRange = getByteRangeValue();
+		if (ByteRange == null || ByteRange.getType() != COSObjType.COS_ARRAY) {
+			return null;
+		}
+		if (ByteRange.size() <= 0) {
+			return null;
+		}
 		return new GFAArrayOf_4Integers(ByteRange.getDirectBase(), null, null).getentry0HasTypeInteger();
 	}
 
 	@Override
 	public Boolean getByteRange3HasTypeInteger() {
 		COSObject ByteRange = getByteRangeValue();
+		if (ByteRange == null || ByteRange.getType() != COSObjType.COS_ARRAY) {
+			return null;
+		}
+		if (ByteRange.size() <= 3) {
+			return null;
+		}
 		return new GFAArrayOf_4Integers(ByteRange.getDirectBase(), null, null).getentry3HasTypeInteger();
 	}
 
diff --git a/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFACryptFilterMap.java b/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFACryptFilterMap.java
index 6eca17dee..10c697ff2 100644
--- a/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFACryptFilterMap.java
+++ b/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFACryptFilterMap.java
@@ -139,6 +139,9 @@ public Boolean getStdCFHasTypeDictionary() {
 	@Override
 	public String getStdCFAuthEventNameValue() {
 		COSObject StdCF = getStdCFValue();
+		if (StdCF == null || !StdCF.getType().isDictionaryBased()) {
+			return null;
+		}
 		return new GFACryptFilter(StdCF.getDirectBase(), null, null).getAuthEventNameValue();
 	}
 
diff --git a/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAFloatingWindowParameters.java b/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAFloatingWindowParameters.java
index 8790996da..c2f350e89 100644
--- a/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAFloatingWindowParameters.java
+++ b/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAFloatingWindowParameters.java
@@ -343,26 +343,50 @@ public Boolean getUCHasTypeBoolean() {
 	}
 
 	@Override
-	public Long getD1IntegerValue() {
+	public Long getD0IntegerValue() {
 		COSObject D = getDValue();
-		return new GFAArrayOf_2Integers(D.getDirectBase(), null, null).getentry1IntegerValue();
+		if (D == null || D.getType() != COSObjType.COS_ARRAY) {
+			return null;
+		}
+		if (D.size() <= 0) {
+			return null;
+		}
+		return new GFAArrayOf_2Integers(D.getDirectBase(), null, null).getentry0IntegerValue();
 	}
 
 	@Override
-	public Long getD0IntegerValue() {
+	public Long getD1IntegerValue() {
 		COSObject D = getDValue();
-		return new GFAArrayOf_2Integers(D.getDirectBase(), null, null).getentry0IntegerValue();
+		if (D == null || D.getType() != COSObjType.COS_ARRAY) {
+			return null;
+		}
+		if (D.size() <= 1) {
+			return null;
+		}
+		return new GFAArrayOf_2Integers(D.getDirectBase(), null, null).getentry1IntegerValue();
 	}
 
 	@Override
 	public Boolean getD1HasTypeInteger() {
 		COSObject D = getDValue();
+		if (D == null || D.getType() != COSObjType.COS_ARRAY) {
+			return null;
+		}
+		if (D.size() <= 1) {
+			return null;
+		}
 		return new GFAArrayOf_2Integers(D.getDirectBase(), null, null).getentry1HasTypeInteger();
 	}
 
 	@Override
 	public Boolean getD0HasTypeInteger() {
 		COSObject D = getDValue();
+		if (D == null || D.getType() != COSObjType.COS_ARRAY) {
+			return null;
+		}
+		if (D.size() <= 0) {
+			return null;
+		}
 		return new GFAArrayOf_2Integers(D.getDirectBase(), null, null).getentry0HasTypeInteger();
 	}
 
diff --git a/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAFontDescriptorCIDType0.java b/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAFontDescriptorCIDType0.java
index 75f4e7883..3f625dad9 100644
--- a/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAFontDescriptorCIDType0.java
+++ b/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAFontDescriptorCIDType0.java
@@ -716,6 +716,9 @@ public Boolean getXHeightHasTypeNumber() {
 
 	@Override
 	public String getparentBaseFontNameValue() {
+		if (this.parentObject == null || !this.parentObject.getType().isDictionaryBased()) {
+			return null;
+		}
 		return new GFAFontCIDType0(this.parentObject.getDirectBase(), null, null).getBaseFontNameValue();
 	}
 
diff --git a/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAFontDescriptorCIDType2.java b/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAFontDescriptorCIDType2.java
index 4ee936605..ab563ed95 100644
--- a/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAFontDescriptorCIDType2.java
+++ b/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAFontDescriptorCIDType2.java
@@ -716,6 +716,9 @@ public Boolean getXHeightHasTypeNumber() {
 
 	@Override
 	public String getparentBaseFontNameValue() {
+		if (this.parentObject == null || !this.parentObject.getType().isDictionaryBased()) {
+			return null;
+		}
 		return new GFAFontCIDType2(this.parentObject.getDirectBase(), null, null).getBaseFontNameValue();
 	}
 
diff --git a/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAFontDescriptorTrueType.java b/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAFontDescriptorTrueType.java
index df2e1e98b..4c1fd0b7c 100644
--- a/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAFontDescriptorTrueType.java
+++ b/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAFontDescriptorTrueType.java
@@ -498,6 +498,9 @@ public Boolean getXHeightHasTypeNumber() {
 
 	@Override
 	public String getparentBaseFontNameValue() {
+		if (this.parentObject == null || !this.parentObject.getType().isDictionaryBased()) {
+			return null;
+		}
 		return new GFAFontTrueType(this.parentObject.getDirectBase(), null, null).getBaseFontNameValue();
 	}
 
diff --git a/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAFontDescriptorType3.java b/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAFontDescriptorType3.java
index e9df1b13b..5b60b9dcd 100644
--- a/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAFontDescriptorType3.java
+++ b/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAFontDescriptorType3.java
@@ -384,6 +384,9 @@ public Boolean getXHeightHasTypeNumber() {
 
 	@Override
 	public String getparentNameNameValue() {
+		if (this.parentObject == null || !this.parentObject.getType().isDictionaryBased()) {
+			return null;
+		}
 		return new GFAFontType3(this.parentObject.getDirectBase(), null, null).getNameNameValue();
 	}
 
diff --git a/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAIconFit.java b/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAIconFit.java
index 6af02e6da..2fe9df9fe 100644
--- a/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAIconFit.java
+++ b/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAIconFit.java
@@ -176,26 +176,50 @@ public String getSWNameValue() {
 	}
 
 	@Override
-	public Double getA1NumberValue() {
+	public Double getA0NumberValue() {
 		COSObject A = getAValue();
-		return new GFAArrayOf_2Numbers(A.getDirectBase(), null, null).getentry1NumberValue();
+		if (A == null || A.getType() != COSObjType.COS_ARRAY) {
+			return null;
+		}
+		if (A.size() <= 0) {
+			return null;
+		}
+		return new GFAArrayOf_2Numbers(A.getDirectBase(), null, null).getentry0NumberValue();
 	}
 
 	@Override
-	public Double getA0NumberValue() {
+	public Double getA1NumberValue() {
 		COSObject A = getAValue();
-		return new GFAArrayOf_2Numbers(A.getDirectBase(), null, null).getentry0NumberValue();
+		if (A == null || A.getType() != COSObjType.COS_ARRAY) {
+			return null;
+		}
+		if (A.size() <= 1) {
+			return null;
+		}
+		return new GFAArrayOf_2Numbers(A.getDirectBase(), null, null).getentry1NumberValue();
 	}
 
 	@Override
 	public Boolean getA1HasTypeNumber() {
 		COSObject A = getAValue();
+		if (A == null || A.getType() != COSObjType.COS_ARRAY) {
+			return null;
+		}
+		if (A.size() <= 1) {
+			return null;
+		}
 		return new GFAArrayOf_2Numbers(A.getDirectBase(), null, null).getentry1HasTypeNumber();
 	}
 
 	@Override
 	public Boolean getA0HasTypeNumber() {
 		COSObject A = getAValue();
+		if (A == null || A.getType() != COSObjType.COS_ARRAY) {
+			return null;
+		}
+		if (A.size() <= 0) {
+			return null;
+		}
 		return new GFAArrayOf_2Numbers(A.getDirectBase(), null, null).getentry0HasTypeNumber();
 	}
 
diff --git a/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAMovieActivation.java b/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAMovieActivation.java
index b486f82d4..bd9d77093 100644
--- a/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAMovieActivation.java
+++ b/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAMovieActivation.java
@@ -459,48 +459,96 @@ public Double getVolumeNumberValue() {
 	@Override
 	public Double getFWPosition0NumberValue() {
 		COSObject FWPosition = getFWPositionValue();
+		if (FWPosition == null || FWPosition.getType() != COSObjType.COS_ARRAY) {
+			return null;
+		}
+		if (FWPosition.size() <= 0) {
+			return null;
+		}
 		return new GFAArrayOf_2Numbers(FWPosition.getDirectBase(), null, null).getentry0NumberValue();
 	}
 
 	@Override
 	public Double getFWPosition1NumberValue() {
 		COSObject FWPosition = getFWPositionValue();
+		if (FWPosition == null || FWPosition.getType() != COSObjType.COS_ARRAY) {
+			return null;
+		}
+		if (FWPosition.size() <= 1) {
+			return null;
+		}
 		return new GFAArrayOf_2Numbers(FWPosition.getDirectBase(), null, null).getentry1NumberValue();
 	}
 
 	@Override
 	public Long getFWScale0IntegerValue() {
 		COSObject FWScale = getFWScaleValue();
+		if (FWScale == null || FWScale.getType() != COSObjType.COS_ARRAY) {
+			return null;
+		}
+		if (FWScale.size() <= 0) {
+			return null;
+		}
 		return new GFAArrayOf_2Integers(FWScale.getDirectBase(), null, null).getentry0IntegerValue();
 	}
 
 	@Override
 	public Long getFWScale1IntegerValue() {
 		COSObject FWScale = getFWScaleValue();
+		if (FWScale == null || FWScale.getType() != COSObjType.COS_ARRAY) {
+			return null;
+		}
+		if (FWScale.size() <= 1) {
+			return null;
+		}
 		return new GFAArrayOf_2Integers(FWScale.getDirectBase(), null, null).getentry1IntegerValue();
 	}
 
 	@Override
 	public Boolean getFWPosition0HasTypeNumber() {
 		COSObject FWPosition = getFWPositionValue();
+		if (FWPosition == null || FWPosition.getType() != COSObjType.COS_ARRAY) {
+			return null;
+		}
+		if (FWPosition.size() <= 0) {
+			return null;
+		}
 		return new GFAArrayOf_2Numbers(FWPosition.getDirectBase(), null, null).getentry0HasTypeNumber();
 	}
 
 	@Override
 	public Boolean getFWPosition1HasTypeNumber() {
 		COSObject FWPosition = getFWPositionValue();
+		if (FWPosition == null || FWPosition.getType() != COSObjType.COS_ARRAY) {
+			return null;
+		}
+		if (FWPosition.size() <= 1) {
+			return null;
+		}
 		return new GFAArrayOf_2Numbers(FWPosition.getDirectBase(), null, null).getentry1HasTypeNumber();
 	}
 
 	@Override
 	public Boolean getFWScale0HasTypeInteger() {
 		COSObject FWScale = getFWScaleValue();
+		if (FWScale == null || FWScale.getType() != COSObjType.COS_ARRAY) {
+			return null;
+		}
+		if (FWScale.size() <= 0) {
+			return null;
+		}
 		return new GFAArrayOf_2Integers(FWScale.getDirectBase(), null, null).getentry0HasTypeInteger();
 	}
 
 	@Override
 	public Boolean getFWScale1HasTypeInteger() {
 		COSObject FWScale = getFWScaleValue();
+		if (FWScale == null || FWScale.getType() != COSObjType.COS_ARRAY) {
+			return null;
+		}
+		if (FWScale.size() <= 1) {
+			return null;
+		}
 		return new GFAArrayOf_2Integers(FWScale.getDirectBase(), null, null).getentry1HasTypeInteger();
 	}
 
diff --git a/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAOPIVersion20Dict.java b/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAOPIVersion20Dict.java
index 37ad116d8..085199ce6 100644
--- a/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAOPIVersion20Dict.java
+++ b/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAOPIVersion20Dict.java
@@ -386,51 +386,99 @@ public Double getVersionNumberValue() {
 		return getNumberValue(Version);
 	}
 
+	@Override
+	public Long getIncludedImageDimensions0IntegerValue() {
+		COSObject IncludedImageDimensions = getIncludedImageDimensionsValue();
+		if (IncludedImageDimensions == null || IncludedImageDimensions.getType() != COSObjType.COS_ARRAY) {
+			return null;
+		}
+		if (IncludedImageDimensions.size() <= 0) {
+			return null;
+		}
+		return new GFAArrayOf_2Integers(IncludedImageDimensions.getDirectBase(), null, null).getentry0IntegerValue();
+	}
+
 	@Override
 	public Long getIncludedImageDimensions1IntegerValue() {
 		COSObject IncludedImageDimensions = getIncludedImageDimensionsValue();
+		if (IncludedImageDimensions == null || IncludedImageDimensions.getType() != COSObjType.COS_ARRAY) {
+			return null;
+		}
+		if (IncludedImageDimensions.size() <= 1) {
+			return null;
+		}
 		return new GFAArrayOf_2Integers(IncludedImageDimensions.getDirectBase(), null, null).getentry1IntegerValue();
 	}
 
 	@Override
 	public Double getSize0NumberValue() {
 		COSObject Size = getSizeValue();
+		if (Size == null || Size.getType() != COSObjType.COS_ARRAY) {
+			return null;
+		}
+		if (Size.size() <= 0) {
+			return null;
+		}
 		return new GFAArrayOf_2Numbers(Size.getDirectBase(), null, null).getentry0NumberValue();
 	}
 
-	@Override
-	public Long getIncludedImageDimensions0IntegerValue() {
-		COSObject IncludedImageDimensions = getIncludedImageDimensionsValue();
-		return new GFAArrayOf_2Integers(IncludedImageDimensions.getDirectBase(), null, null).getentry0IntegerValue();
-	}
-
 	@Override
 	public Double getSize1NumberValue() {
 		COSObject Size = getSizeValue();
+		if (Size == null || Size.getType() != COSObjType.COS_ARRAY) {
+			return null;
+		}
+		if (Size.size() <= 1) {
+			return null;
+		}
 		return new GFAArrayOf_2Numbers(Size.getDirectBase(), null, null).getentry1NumberValue();
 	}
 
 	@Override
 	public Boolean getIncludedImageDimensions1HasTypeInteger() {
 		COSObject IncludedImageDimensions = getIncludedImageDimensionsValue();
+		if (IncludedImageDimensions == null || IncludedImageDimensions.getType() != COSObjType.COS_ARRAY) {
+			return null;
+		}
+		if (IncludedImageDimensions.size() <= 1) {
+			return null;
+		}
 		return new GFAArrayOf_2Integers(IncludedImageDimensions.getDirectBase(), null, null).getentry1HasTypeInteger();
 	}
 
 	@Override
 	public Boolean getSize0HasTypeNumber() {
 		COSObject Size = getSizeValue();
+		if (Size == null || Size.getType() != COSObjType.COS_ARRAY) {
+			return null;
+		}
+		if (Size.size() <= 0) {
+			return null;
+		}
 		return new GFAArrayOf_2Numbers(Size.getDirectBase(), null, null).getentry0HasTypeNumber();
 	}
 
 	@Override
 	public Boolean getIncludedImageDimensions0HasTypeInteger() {
 		COSObject IncludedImageDimensions = getIncludedImageDimensionsValue();
+		if (IncludedImageDimensions == null || IncludedImageDimensions.getType() != COSObjType.COS_ARRAY) {
+			return null;
+		}
+		if (IncludedImageDimensions.size() <= 0) {
+			return null;
+		}
 		return new GFAArrayOf_2Integers(IncludedImageDimensions.getDirectBase(), null, null).getentry0HasTypeInteger();
 	}
 
 	@Override
 	public Boolean getSize1HasTypeNumber() {
 		COSObject Size = getSizeValue();
+		if (Size == null || Size.getType() != COSObjType.COS_ARRAY) {
+			return null;
+		}
+		if (Size.size() <= 1) {
+			return null;
+		}
 		return new GFAArrayOf_2Numbers(Size.getDirectBase(), null, null).getentry1HasTypeNumber();
 	}
 
diff --git a/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFASoftMaskLuminosity.java b/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFASoftMaskLuminosity.java
index 110793292..ae3670882 100644
--- a/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFASoftMaskLuminosity.java
+++ b/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFASoftMaskLuminosity.java
@@ -309,6 +309,9 @@ public COSObject getGGroupValue() {
 	@Override
 	public String getGGroupSNameValue() {
 		COSObject GGroup = getGGroupValue();
+		if (GGroup == null || !GGroup.getType().isDictionaryBased()) {
+			return null;
+		}
 		return new GFAGroupAttributes(GGroup.getDirectBase(), null, null).getSNameValue();
 	}
 
diff --git a/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAUserProperty.java b/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAUserProperty.java
index 0ae898bf9..d220babee 100644
--- a/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAUserProperty.java
+++ b/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAUserProperty.java
@@ -201,6 +201,9 @@ public COSObject gettrailerCatalogMarkInfoValue() {
 	@Override
 	public Boolean gettrailerCatalogMarkInfoUserPropertiesBooleanValue() {
 		COSObject trailerCatalogMarkInfo = gettrailerCatalogMarkInfoValue();
+		if (trailerCatalogMarkInfo == null || !trailerCatalogMarkInfo.getType().isDictionaryBased()) {
+			return null;
+		}
 		return new GFAMarkInfo(trailerCatalogMarkInfo.getDirectBase(), null, null).getUserPropertiesBooleanValue();
 	}
 
diff --git a/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAViewerPreferences.java b/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAViewerPreferences.java
index e95843157..8170d8176 100644
--- a/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAViewerPreferences.java
+++ b/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAViewerPreferences.java
@@ -646,6 +646,9 @@ public COSObject gettrailerCatalogValue() {
 	@Override
 	public String gettrailerCatalogPageModeNameValue() {
 		COSObject trailerCatalog = gettrailerCatalogValue();
+		if (trailerCatalog == null || !trailerCatalog.getType().isDictionaryBased()) {
+			return null;
+		}
 		return new GFACatalog(trailerCatalog.getDirectBase(), null, null).getPageModeNameValue();
 	}
 
diff --git a/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAXObjectImageMask.java b/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAXObjectImageMask.java
index cce6718ee..9d2ede686 100644
--- a/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAXObjectImageMask.java
+++ b/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAXObjectImageMask.java
@@ -1364,18 +1364,18 @@ public Boolean getimageIsStructContentItem() {
 		return getimageIsStructContentItem(new COSObject(this.baseObject));
 	}
 
-	@Override
-	public Long getDecode1IntegerValue() {
-		COSObject Decode1 = getDecode1Value();
-		return getIntegerValue(Decode1);
-	}
-
 	@Override
 	public Long getDecode0IntegerValue() {
 		COSObject Decode0 = getDecode0Value();
 		return getIntegerValue(Decode0);
 	}
 
+	@Override
+	public Long getDecode1IntegerValue() {
+		COSObject Decode1 = getDecode1Value();
+		return getIntegerValue(Decode1);
+	}
+
 	@Override
 	public Boolean gethasExtensionADBE_Extn3() {
 		return false;
diff --git a/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAXObjectImageSoftMask.java b/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAXObjectImageSoftMask.java
index 3c15122f5..953f5c863 100644
--- a/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAXObjectImageSoftMask.java
+++ b/validation-model/src/main/java/org/verapdf/gf/model/impl/arlington/GFAXObjectImageSoftMask.java
@@ -910,18 +910,18 @@ public COSObject getparentWidthValue() {
 		return Width;
 	}
 
-	@Override
-	public Long getparentWidthIntegerValue() {
-		COSObject parentWidth = getparentWidthValue();
-		return getIntegerValue(parentWidth);
-	}
-
 	@Override
 	public Long getparentHeightIntegerValue() {
 		COSObject parentHeight = getparentHeightValue();
 		return getIntegerValue(parentHeight);
 	}
 
+	@Override
+	public Long getparentWidthIntegerValue() {
+		COSObject parentWidth = getparentWidthValue();
+		return getIntegerValue(parentWidth);
+	}
+
 	@Override
 	public Boolean getparentWidthHasTypeInteger() {
 		COSObject parentWidth = getparentWidthValue();