diff --git a/js/main.js b/js/main.js
index f9196ac..f408755 100644
--- a/js/main.js
+++ b/js/main.js
@@ -133,7 +133,7 @@ document.addEventListener("keydown", e => {
                 history.index++;
                 textCur.textContent = history.list[history.index];
                 cursorPosition = textCur.textContent.length;
-            } else {
+            } else if (history.index < history.list.length) {
                 history.index++;
                 textCur.textContent = "";
                 cursorPosition = 0;