diff --git a/wordle.js b/wordle.js
index 0217521..52088ec 100644
--- a/wordle.js
+++ b/wordle.js
@@ -172,4 +172,8 @@ function gen_all_words_list() {
 }
 
 function words_len(v) {
+  for (var i = 0; i < v.length; i++) {
+    if (v[i] == LIST_END) return i
+  }
+  return v.length
 }