diff --git a/src/hb-aat-layout-morx-table.hh b/src/hb-aat-layout-morx-table.hh
index 3bad5517f..23c9ef2dd 100644
--- a/src/hb-aat-layout-morx-table.hh
+++ b/src/hb-aat-layout-morx-table.hh
@@ -608,6 +608,8 @@ struct InsertionSubtable
       hb_buffer_t *buffer = driver->buffer;
       unsigned int flags = entry->flags;
 
+      if (0)
+	c->sanitizer.check_range (nullptr, 0);
 #if 0
       if (flags & SetComponent)
       {