diff --git a/src/ai.cpp b/src/ai.cpp
index 745ed3d1a07..42ae2fde79d 100644
--- a/src/ai.cpp
+++ b/src/ai.cpp
@@ -604,6 +604,11 @@ int aiBestNearestTarget(DROID *psDroid, BASE_OBJECT **ppsObj, int weapon_slot, i
 		BASE_OBJECT *friendlyObj = nullptr;
 		BASE_OBJECT *targetInQuestion = *gi;
 
+		if (targetInQuestion == nullptr || isDead(targetInQuestion))
+		{
+			continue;
+		}
+
 		/* This is a friendly unit, check if we can reuse its target */
 		if (aiCheckAlliances(targetInQuestion->player, psDroid->player))
 		{
diff --git a/src/droid.cpp b/src/droid.cpp
index 970cf33b9ce..237868c1b14 100644
--- a/src/droid.cpp
+++ b/src/droid.cpp
@@ -2279,12 +2279,20 @@ UDWORD	getNumDroidsForLevel(uint32_t player, UDWORD level)
 		}
 		for (const DROID* psDroid : *dList)
 		{
+			if (psDroid == nullptr || isDead(psDroid))
+			{
+				continue;
+			}
 			if (getDroidLevel(psDroid) == level)
 			{
 				++count;
 			}
 			if (psDroid->isTransporter())
 			{
+				if (psDroid->psGroup == nullptr)
+				{
+					continue;
+				}
 				for (const DROID *psCurr : psDroid->psGroup->psList)
 				{
 					if (psCurr != psDroid && getDroidLevel(psCurr) == level)
diff --git a/src/loop.cpp b/src/loop.cpp
index 9d64d8759b8..71d505b1917 100644
--- a/src/loop.cpp
+++ b/src/loop.cpp
@@ -460,7 +460,11 @@ void countUpdate(bool synch)
 		setLasSatExists(false, i);
 		for (const STRUCTURE *psCBuilding : apsStructLists[i])
 		{
-			if (psCBuilding->pStructureType->type == REF_SAT_UPLINK && psCBuilding->status == SS_BUILT)
+			if (psCBuilding == nullptr || isDead(psCBuilding))
+			{
+				continue;
+			}
+			if (psCBuilding->pStructureType && psCBuilding->pStructureType->type == REF_SAT_UPLINK && psCBuilding->status == SS_BUILT)
 			{
 				setSatUplinkExists(true, i);
 			}
@@ -472,7 +476,11 @@ void countUpdate(bool synch)
 		}
 		for (const STRUCTURE *psCBuilding : mission.apsStructLists[i])
 		{
-			if (psCBuilding->pStructureType->type == REF_SAT_UPLINK && psCBuilding->status == SS_BUILT)
+			if (psCBuilding == nullptr || isDead(psCBuilding))
+			{
+				continue;
+			}
+			if (psCBuilding->pStructureType && psCBuilding->pStructureType->type == REF_SAT_UPLINK && psCBuilding->status == SS_BUILT)
 			{
 				setSatUplinkExists(true, i);
 			}
diff --git a/src/scores.cpp b/src/scores.cpp
index ef32fc5e015..70e12a5843c 100644
--- a/src/scores.cpp
+++ b/src/scores.cpp
@@ -310,8 +310,17 @@ END_GAME_STATS_DATA	collectEndGameStatsData()
 			}
 			for (const DROID* psDroid : *dList)
 			{
+				if (psDroid == nullptr || isDead(psDroid))
+				{
+					continue;
+				}
+				++fullStats.numUnits;
 				if (psDroid->isTransporter())
 				{
+					if (psDroid->psGroup == nullptr)
+					{
+						continue;
+					}
 					for (DROID *psCurr : psDroid->psGroup->psList)
 					{
 						if (psCurr != psDroid)
@@ -320,7 +329,6 @@ END_GAME_STATS_DATA	collectEndGameStatsData()
 						}
 					}
 				}
-				++fullStats.numUnits;
 			}
 		} while (++idx < 3);
 	}