diff --git a/lib/src/listener/connect_listener.dart b/lib/src/listener/connect_listener.dart
index 9d72004..a354717 100644
--- a/lib/src/listener/connect_listener.dart
+++ b/lib/src/listener/connect_listener.dart
@@ -4,38 +4,38 @@ class OnConnectListener {
   Function()? onConnectSuccess;
   Function()? onConnecting;
   Function()? onKickedOffline;
-  Function()? onUserSigExpired;
+  Function()? onUserTokenExpired;
 
   OnConnectListener({
     this.onConnectFailed,
     this.onConnectSuccess,
     this.onConnecting,
     this.onKickedOffline,
-    this.onUserSigExpired,
+    this.onUserTokenExpired,
   });
 
   /// SDK连接服务器失败
   void connectFailed(int? code, String? errorMsg) {
-    if (null != onConnectFailed) onConnectFailed!(code, errorMsg);
+    onConnectFailed?.call(code, errorMsg);
   }
 
   /// SDK连接服务器成功
   void connectSuccess() {
-    if (null != onConnectSuccess) onConnectSuccess!();
+    onConnectSuccess?.call();
   }
 
   /// SDK正在连接服务器
   void connecting() {
-    if (null != onConnecting) onConnecting!.call();
+    onConnecting?.call();
   }
 
   /// 账号已在其他地方登录，当前设备被踢下线
   void kickedOffline() {
-    if (null != onKickedOffline) onKickedOffline!();
+    onKickedOffline?.call();
   }
 
   ///  登录凭证过期，需要重新登录
-  void userSigExpired() {
-    if (null != onUserSigExpired) onUserSigExpired!();
+  void userTokenExpired() {
+    onUserTokenExpired?.call();
   }
 }
diff --git a/lib/src/listener/conversation_listener.dart b/lib/src/listener/conversation_listener.dart
index 713da74..12e8a05 100644
--- a/lib/src/listener/conversation_listener.dart
+++ b/lib/src/listener/conversation_listener.dart
@@ -20,29 +20,28 @@ class OnConversationListener {
 
   /// 会话发生改变
   void conversationChanged(List<ConversationInfo> list) {
-    if (onConversationChanged != null) onConversationChanged!(list);
+    onConversationChanged?.call(list);
   }
 
   /// 有新会话产生
   void newConversation(List<ConversationInfo> list) {
-    if (onNewConversation != null) onNewConversation!(list);
+    onNewConversation?.call(list);
   }
 
   /// 未读消息总数发送改变
   void totalUnreadMessageCountChanged(int i) {
-    if (onTotalUnreadMessageCountChanged != null)
-      onTotalUnreadMessageCountChanged!(i);
+    onTotalUnreadMessageCountChanged?.call(i);
   }
 
   void syncServerFailed() {
-    if (onSyncServerFailed != null) onSyncServerFailed!();
+    onSyncServerFailed?.call();
   }
 
   void syncServerFinish() {
-    if (onSyncServerFinish != null) onSyncServerFinish!();
+    onSyncServerFinish?.call();
   }
 
   void syncServerStart() {
-    if (onSyncServerStart != null) onSyncServerStart!();
+    onSyncServerStart?.call();
   }
 }
diff --git a/lib/src/listener/msg_send_progress_listener.dart b/lib/src/listener/msg_send_progress_listener.dart
index c38ddba..9163690 100644
--- a/lib/src/listener/msg_send_progress_listener.dart
+++ b/lib/src/listener/msg_send_progress_listener.dart
@@ -6,6 +6,6 @@ class OnMsgSendProgressListener {
 
   /// 消息发送进度
   void progress(String clientMsgID, int progress) {
-    if (null != onProgress) onProgress!(clientMsgID, progress);
+    onProgress?.call(clientMsgID, progress);
   }
 }
diff --git a/lib/src/manager/im_manager.dart b/lib/src/manager/im_manager.dart
index b1d3db1..34a65b2 100644
--- a/lib/src/manager/im_manager.dart
+++ b/lib/src/manager/im_manager.dart
@@ -57,8 +57,8 @@ class IMManager {
             case 'onKickedOffline':
               _connectListener.kickedOffline();
               break;
-            case 'onUserSigExpired':
-              _connectListener.userSigExpired();
+            case 'onUserTokenExpired':
+              _connectListener.userTokenExpired();
               break;
           }
         } else if (call.method == ListenerType.userListener) {