diff --git a/frontend/src/ts/test/caret.ts b/frontend/src/ts/test/caret.ts
index 34396cf72..72112666e 100644
--- a/frontend/src/ts/test/caret.ts
+++ b/frontend/src/ts/test/caret.ts
@@ -63,7 +63,7 @@ export async function updatePosition(): Promise<void> {
   ] as HTMLElement;
 
   const previousLetter: HTMLElement = currentWordNodeList[
-    currentLetterIndex - 1
+    Math.min(currentLetterIndex - 1, currentWordNodeList.length - 1)
   ] as HTMLElement;
 
   const currentLanguage = await Misc.getCurrentLanguage(Config.language);