From 6b4c1dc8ab0169e64e534c8ad91df06244d27f82 Mon Sep 17 00:00:00 2001
From: Sahejkm <163521239+Sahejkm@users.noreply.github.com>
Date: Tue, 21 May 2024 17:47:40 +0800
Subject: [PATCH] [Lexical] add null check for key undefined before calling
 toLowerCase function (#6154)

---
 packages/lexical/src/LexicalEvents.ts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/packages/lexical/src/LexicalEvents.ts b/packages/lexical/src/LexicalEvents.ts
index e81ce0a5124..c56806c596e 100644
--- a/packages/lexical/src/LexicalEvents.ts
+++ b/packages/lexical/src/LexicalEvents.ts
@@ -1005,6 +1005,10 @@ function onKeyDown(event: KeyboardEvent, editor: LexicalEditor): void {
     return;
   }
 
+  if (key == null) {
+    return;
+  }
+
   if (isMoveForward(key, ctrlKey, altKey, metaKey)) {
     dispatchCommand(editor, KEY_ARROW_RIGHT_COMMAND, event);
   } else if (isMoveToEnd(key, ctrlKey, shiftKey, altKey, metaKey)) {