diff --git a/javascript/0392-is-subsequence.js b/javascript/0392-is-subsequence.js
index 41bc09cdc..6f8fee951 100644
--- a/javascript/0392-is-subsequence.js
+++ b/javascript/0392-is-subsequence.js
@@ -11,7 +11,7 @@ var isSubsequence = function(s, t) {
     
     let j = 0;
     
-    for(let i = 0; i < t.length; i++) {
+    for(let i = 0; i < t.length && j < s.length; i++) {
         if(s[j] === t[i]) {
             j++;
         }