diff --git a/scripts/hiddenapi/verify_overlaps.py b/scripts/hiddenapi/verify_overlaps.py
index a4a423e..6432bf1 100755
--- a/scripts/hiddenapi/verify_overlaps.py
+++ b/scripts/hiddenapi/verify_overlaps.py
@@ -331,8 +331,11 @@
     for signature in allSignatures:
         monolithicRow = monolithicFlagsDict.get(signature, {})
         monolithicFlags = monolithicRow.get(None, [])
-        modularRow = modularFlagsDict.get(signature, {})
-        modularFlags = modularRow.get(None, [])
+        if signature in modularFlagsDict:
+            modularRow = modularFlagsDict.get(signature, {})
+            modularFlags = modularRow.get(None, [])
+        else:
+            modularFlags = ["blocked"]
         if monolithicFlags != modularFlags:
             mismatchingSignatures.append((signature, modularFlags, monolithicFlags))
     return mismatchingSignatures