diff --git a/src/hb-ot-shape-complex-arabic-fallback.hh b/src/hb-ot-shape-complex-arabic-fallback.hh
index 262ab8a1f..244e967b1 100644
--- a/src/hb-ot-shape-complex-arabic-fallback.hh
+++ b/src/hb-ot-shape-complex-arabic-fallback.hh
@@ -92,7 +92,7 @@ arabic_fallback_synthesize_lookup_single (const hb_ot_shape_plan_t *plan HB_UNUS
 				       hb_array (substitutes, num_glyphs));
   c.end_serialize ();
 
-  return ret ? c.copy<OT::SubstLookup> () : nullptr;
+  return ret && !c.in_error () ? c.copy<OT::SubstLookup> () : nullptr;
 }
 
 static OT::SubstLookup *
@@ -170,7 +170,7 @@ arabic_fallback_synthesize_lookup_ligature (const hb_ot_shape_plan_t *plan HB_UN
   c.end_serialize ();
   /* TODO sanitize the results? */
 
-  return ret ? c.copy<OT::SubstLookup> () : nullptr;
+  return ret && !c.in_error () ? c.copy<OT::SubstLookup> () : nullptr;
 }
 
 static OT::SubstLookup *
diff --git a/test/fuzzing/fonts/clusterfuzz-testcase-minimized-hb-shape-fuzzer-5138182937772032 b/test/fuzzing/fonts/clusterfuzz-testcase-minimized-hb-shape-fuzzer-5138182937772032
new file mode 100644
index 000000000..2f2f7b89e
Binary files /dev/null and b/test/fuzzing/fonts/clusterfuzz-testcase-minimized-hb-shape-fuzzer-5138182937772032 differ