diff --git a/src/hb-serialize.hh b/src/hb-serialize.hh
index 3ce1b8019..4566153a5 100644
--- a/src/hb-serialize.hh
+++ b/src/hb-serialize.hh
@@ -332,6 +332,7 @@ struct hb_serialize_context_t
 
   unsigned to_bias (const void *base) const
   {
+    if (unlikely (in_error ())) return 0;
     if (!base) return 0;
     assert (current);
     assert (current->head <= (const char *) base);
diff --git a/test/fuzzing/fonts/clusterfuzz-testcase-minimized-hb-subset-fuzzer-5927551890096128 b/test/fuzzing/fonts/clusterfuzz-testcase-minimized-hb-subset-fuzzer-5927551890096128
new file mode 100644
index 000000000..a5f5af8c8
Binary files /dev/null and b/test/fuzzing/fonts/clusterfuzz-testcase-minimized-hb-subset-fuzzer-5927551890096128 differ