diff --git a/app/src/protyle/wysiwyg/keydown.ts b/app/src/protyle/wysiwyg/keydown.ts
index ef209d7dd..421195749 100644
--- a/app/src/protyle/wysiwyg/keydown.ts
+++ b/app/src/protyle/wysiwyg/keydown.ts
@@ -93,9 +93,6 @@ export const getContentByInlineHTML = (range: Range, cb: (content: string) => vo
 
 export const keydown = (protyle: IProtyle, editorElement: HTMLElement) => {
     editorElement.addEventListener("keydown", async (event: KeyboardEvent & { target: HTMLElement }) => {
-        if (!event.key) {
-            return;
-        }
         if (event.target.localName === "protyle-html" || event.target.localName === "input") {
             event.stopPropagation();
             return;
@@ -186,7 +183,7 @@ export const keydown = (protyle: IProtyle, editorElement: HTMLElement) => {
             }
         }
         // 有可能输入 shift+. ，因此需要使用 event.key 来进行判断
-        if (event.key !== "PageUp" && event.key !== "PageDown" && event.key !== "Home" && event.key !== "End" && event.key.indexOf("Arrow") === -1 &&
+        if (typeof event.key === "string" && event.key !== "PageUp" && event.key !== "PageDown" && event.key !== "Home" && event.key !== "End" && event.key.indexOf("Arrow") === -1 &&
             event.key !== "Escape" && event.key !== "Shift" && event.key !== "Meta" && event.key !== "Alt" && event.key !== "Control" && event.key !== "CapsLock" &&
             !isNotEditBlock(nodeElement) && !/^F\d{1,2}$/.test(event.key) &&
             // 微软双拼使用 compositionstart，否则 focusByRange 导致无法输入文字