diff --git a/src/hb-ot-layout-base-table.hh b/src/hb-ot-layout-base-table.hh
index 02fe14fa0..c2c2b2b7a 100644
--- a/src/hb-ot-layout-base-table.hh
+++ b/src/hb-ot-layout-base-table.hh
@@ -384,7 +384,7 @@ struct Axis
     if (likely (coord))
     {
       unsigned int tag_index = 0;
-      (this+baseTagList).bfind (baseline_tag, &tag_index);
+      if (!(this+baseTagList).bfind (baseline_tag, &tag_index)) return false;
       *coord = &base_script.get_base_coord (tag_index);
     }