diff --git a/src/js/hntrie.js b/src/js/hntrie.js
index d4953310c..f125b2e6a 100644
--- a/src/js/hntrie.js
+++ b/src/js/hntrie.js
@@ -266,7 +266,8 @@ class HNTrieContainer {
                 this.add(itrie);
             }
         }
-        this.needle = ''; // Important
+        this.needle = '';   // Important
+        this.buf[255] = 0;  // Important
         return itrie;
     }