diff --git a/resources/views/chat/partials/scripts.blade.php b/resources/views/chat/partials/scripts.blade.php
index 4c6a0e1..de9a27d 100644
--- a/resources/views/chat/partials/scripts.blade.php
+++ b/resources/views/chat/partials/scripts.blade.php
@@ -24,6 +24,7 @@
 
     let onlineUsers = {};
     let autoScroll = true;
+    let _maxMsgId = 0; // 记录当前收到的最大消息 ID
 
     // ── Tab 切换 ──────────────────────────────────────
     function switchTab(tab) {
@@ -67,9 +68,12 @@
     }
 
     // ── 自动滚屏 ──────────────────────────────────────
-    document.getElementById('auto_scroll').addEventListener('change', function() {
-        autoScroll = this.checked;
-    });
+    const autoScrollEl = document.getElementById('auto_scroll');
+    if (autoScrollEl) {
+        autoScrollEl.addEventListener('change', function() {
+            autoScroll = this.checked;
+        });
+    }
 
     // ── 滚动到底部 ───────────────────────────────────
     function scrollToBottom() {
@@ -890,7 +894,6 @@
     }
 
     // ── 本地清屏（仅限自己的屏幕）───────────────────────────
-    let _maxMsgId = 0; // 记录当前收到的最大消息 ID
 
     function localClearScreen() {
         // 清理公聊窗口