diff --git a/news/1849.bugfix b/news/1849.bugfix
new file mode 100644
index 000000000..29cc13e7c
--- /dev/null
+++ b/news/1849.bugfix
@@ -0,0 +1 @@
+Make slate block linkintegrity checking more robust in case data isn't in the expected format. @cekk
diff --git a/src/plone/restapi/blocks_linkintegrity.py b/src/plone/restapi/blocks_linkintegrity.py
index 754f5c256..dc5343ff1 100644
--- a/src/plone/restapi/blocks_linkintegrity.py
+++ b/src/plone/restapi/blocks_linkintegrity.py
@@ -69,9 +69,8 @@ def __init__(self, context, request):
     def __call__(self, block):
         value = (block or {}).get(self.field, [])
         children = iterate_children(value or [])
-
         for child in children:
-            node_type = child.get("type")
+            node_type = child.get("type", "")
             if node_type:
                 handler = getattr(self, f"handle_{node_type}", None)
                 if handler:
diff --git a/src/plone/restapi/deserializer/blocks.py b/src/plone/restapi/deserializer/blocks.py
index 59e26a807..e4a8f825b 100644
--- a/src/plone/restapi/deserializer/blocks.py
+++ b/src/plone/restapi/deserializer/blocks.py
@@ -24,9 +24,10 @@ def iterate_children(value):
     queue = deque(value)
     while queue:
         child = queue.pop()
-        yield child
-        if child.get("children"):
-            queue.extend(child["children"] or [])
+        if isinstance(child, dict):
+            yield child
+            if child.get("children", []):
+                queue.extend(child["children"] or [])
 
 
 @implementer(IFieldDeserializer)