diff --git a/plugins/devel/check-structures-sanity/dispatch.cpp b/plugins/devel/check-structures-sanity/dispatch.cpp
index fcc6b0b8e..f6342d03c 100644
--- a/plugins/devel/check-structures-sanity/dispatch.cpp
+++ b/plugins/devel/check-structures-sanity/dispatch.cpp
@@ -67,6 +67,11 @@ bool Checker::queue_item(const QueueItem & item, CheckedStructure cs)
         auto offset = uintptr_t(item.ptr) - uintptr_t(prev->first);
         if (!prev->second.second.has_type_at_offset(cs, offset))
         {
+            if (offset == 0 && cs.identity == df::identity_traits<void *>::get())
+            {
+                FAIL("unknown pointer is " << prev->second.second.identity->getFullName() << ", previously seen at " << prev->second.first);
+                return false;
+            }
             // TODO
             FAIL("TODO: handle merging structures: " << item.path << " overlaps " << prev->second.first << " (backward)");
             return false;
diff --git a/plugins/devel/check-structures-sanity/types.cpp b/plugins/devel/check-structures-sanity/types.cpp
index 9e565215a..86d691f1d 100644
--- a/plugins/devel/check-structures-sanity/types.cpp
+++ b/plugins/devel/check-structures-sanity/types.cpp
@@ -129,7 +129,6 @@ bool CheckedStructure::has_type_at_offset(const CheckedStructure & type, size_t
     auto st = dynamic_cast<struct_identity *>(identity);
     if (!st)
     {
-        UNEXPECTED;
         return false;
     }