diff --git a/CHANGELOG.md b/CHANGELOG.md
index e1bc425..aa8ee32 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -105,4 +105,6 @@
 ### 1.5.2
  * fix: Add search channel and message method
 ### 1.5.3
- * fix: Compatibility message extension editing content is empty, parsing error issue
\ No newline at end of file
+ * fix: Compatibility message extension editing content is empty, parsing error issue
+### 1.5.4
+ * fix: Update sync channel message
\ No newline at end of file
diff --git a/example/lib/chat.dart b/example/lib/chat.dart
index 9882b36..dc01692 100644
--- a/example/lib/chat.dart
+++ b/example/lib/chat.dart
@@ -153,6 +153,7 @@ class ChatListDataState extends State<ChatList> {
   getMsgList(int oldestOrderSeq, int pullMode, bool isReset) {
     WKIM.shared.messageManager.getOrSyncHistoryMessages(channelID, channelType,
         oldestOrderSeq, oldestOrderSeq == 0, pullMode, 5, 0, (list) {
+      print('同步完成${list.length}条消息');
       List<UIMsg> uiList = [];
       for (int i = 0; i < list.length; i++) {
         if (pullMode == 0 && !isReset) {
diff --git a/lib/db/const.dart b/lib/db/const.dart
index e083e44..83c6e68 100644
--- a/lib/db/const.dart
+++ b/lib/db/const.dart
@@ -5,6 +5,7 @@ import 'package:wukongimfluttersdk/entity/channel_member.dart';
 import 'package:wukongimfluttersdk/entity/conversation.dart';
 import 'package:wukongimfluttersdk/entity/msg.dart';
 import 'package:wukongimfluttersdk/entity/reminder.dart';
+import 'package:wukongimfluttersdk/model/wk_unknown_content.dart';
 import 'package:wukongimfluttersdk/type/const.dart';
 import 'package:wukongimfluttersdk/wkim.dart';
 
@@ -54,6 +55,8 @@ class WKDBConst {
       if (contentJson != null && contentJson != '') {
         msg.messageContent = WKIM.shared.messageManager
             .getMessageModel(msg.contentType, contentJson);
+      } else {
+        msg.messageContent = WKUnknownContent();
       }
     }
     if (msg.wkMsgExtra!.contentEdit != '') {
diff --git a/lib/db/message.dart b/lib/db/message.dart
index 37f4657..3d2692f 100644
--- a/lib/db/message.dart
+++ b/lib/db/message.dart
@@ -507,6 +507,9 @@ class MessageDB {
             requestCount = 5;
             getOrSyncHistoryMessages(channelId, channelType, oldestOrderSeq,
                 contain, pullMode, limit, iGetOrSyncHistoryMsgBack, syncBack);
+          } else {
+            requestCount = 0;
+            iGetOrSyncHistoryMsgBack(list);
           }
         } else {
           requestCount = 0;
diff --git a/pubspec.yaml b/pubspec.yaml
index 1191bca..3b109d0 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -15,7 +15,7 @@ description: wukong IM flutter sdk
 # https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
 # In Windows, build-name is used as the major, minor, and patch parts
 # of the product and file versions while build-number is used as the build suffix.
-version: 1.5.3
+version: 1.5.4
 homepage: https://github.com/WuKongIM/WuKongIMFlutterSDK
 
 environment: