diff --git a/influxdb_wrapper.py b/influxdb_wrapper.py
index ab9181d..6120063 100644
--- a/influxdb_wrapper.py
+++ b/influxdb_wrapper.py
@@ -115,17 +115,32 @@ class InfluxDBClient(QObject):
     @Slot()
     def disconnect(self):
         """断开连接"""
+        # 安全地停止定时器（可能在程序退出时已被销毁）
         if self._timer:
-            self._timer.stop()
+            try:
+                self._timer.stop()
+            except RuntimeError:
+                # QTimer 已被销毁，忽略错误
+                pass
+            self._timer = None
         
         if self._client:
-            self._client.close()
+            try:
+                self._client.close()
+            except Exception:
+                # 客户端可能已被关闭，忽略错误
+                pass
             self._client = None
         
         self._is_connected = False
     
     def __del__(self):
-        self.disconnect()
+        """析构函数：安全地清理资源"""
+        try:
+            self.disconnect()
+        except Exception:
+            # 程序退出时 Qt 对象可能已被销毁，忽略所有异常
+            pass
 
 
 
diff --git a/main.py b/main.py
index 18b21df..1e8d719 100644
--- a/main.py
+++ b/main.py
@@ -1540,6 +1540,10 @@ class MainWindow(QMainWindow):
 
 
 def main():
+    # 抑制 Windows 上 QWebEngineView 的 DirectComposition 警告
+    import os
+    os.environ.setdefault('QT_LOGGING_RULES', 'qt.webenginecontext.debug=false')
+    
     app = QApplication(sys.argv)
     win = MainWindow()
     win.show()