diff --git a/src/pages/chat/components/ChatInput.tsx b/src/pages/chat/components/ChatInput.tsx
index 7cfc5c8..b00cbaf 100644
--- a/src/pages/chat/components/ChatInput.tsx
+++ b/src/pages/chat/components/ChatInput.tsx
@@ -76,11 +76,11 @@ export default function ChatInput(props: {
         setMentionQuery(query);
         // 计算位置 - 使用 inputRef 获取最新 DOM 位置
         requestAnimationFrame(() => {
-          const textarea = inputRef.current;
-          if (!textarea) {
-            console.log('[@mention] inputRef.current is null');
+          if (!(inputRef.current instanceof HTMLTextAreaElement)) {
+            console.log('[@mention] inputRef.current is not textarea:', inputRef.current);
             return;
           }
+          const textarea = inputRef.current;
           const rect = textarea.getBoundingClientRect();
           console.log('[@mention] textarea rect:', rect);
           setMentionPos({ top: rect.bottom, left: rect.left + 10 });