diff --git a/im-center-server/src/main/java/cn/axzo/im/service/impl/MessageTaskServiceImpl.java b/im-center-server/src/main/java/cn/axzo/im/service/impl/MessageTaskServiceImpl.java
index 2ae7b09..70fb74c 100644
--- a/im-center-server/src/main/java/cn/axzo/im/service/impl/MessageTaskServiceImpl.java
+++ b/im-center-server/src/main/java/cn/axzo/im/service/impl/MessageTaskServiceImpl.java
@@ -339,7 +339,9 @@ public class MessageTaskServiceImpl extends ServiceImpl<MessageTaskMapper, Messa
         // 传入app版本号，保证消息能被正常打开
         defaultExtMap.putIfAbsent("minAppVersion", "2.1.0");
         // CMS端收到消息后会根据workspaceId做check
-        defaultExtMap.putIfAbsent("workspaceId", receivePerson.getWorkspaceId().toString());
+        if (receivePerson.getWorkspaceId() != null) {
+            defaultExtMap.putIfAbsent("workspaceId", receivePerson.getWorkspaceId().toString());
+        }
         messageBody.setMessageExtension(defaultExtMap);
 
         return JSONUtil.toJsonStr(messageBody);