diff --git a/webmdec.cc b/webmdec.cc
index 6735ae599..81150aa66 100644
--- a/webmdec.cc
+++ b/webmdec.cc
@@ -164,7 +164,7 @@ int webm_read_frame(struct WebmInputContext *webm_ctx,
       }
       get_new_block = true;
     }
-    if (status) {
+    if (status || block_entry == NULL) {
       return -1;
     }
     if (get_new_block) {