diff --git a/apps/common/sdk/im/utils.py b/apps/common/sdk/im/utils.py
index 2386d0eff..86f41cdc3 100644
--- a/apps/common/sdk/im/utils.py
+++ b/apps/common/sdk/im/utils.py
@@ -29,7 +29,7 @@ def set_default(data: dict, default: dict):
 
 
 class DictWrapper:
-    def __init__(self, data:dict):
+    def __init__(self, data: dict):
         self.raw_data = data
 
     def __getitem__(self, item):
@@ -51,7 +51,7 @@ class DictWrapper:
         return str(self.raw_data)
 
     def __repr__(self):
-        return str(self.raw_data)
+        return repr(self.raw_data)
 
 
 def as_request(func):
diff --git a/apps/common/sdk/im/wecom/__init__.py b/apps/common/sdk/im/wecom/__init__.py
index 7640228e9..6d7c2bf66 100644
--- a/apps/common/sdk/im/wecom/__init__.py
+++ b/apps/common/sdk/im/wecom/__init__.py
@@ -124,6 +124,9 @@ class WeCom(RequestMixin):
             return users
         self._requests.check_errcode_is_0(data)
 
+        if 'invaliduser' not in data:
+            return ()
+
         invaliduser = data['invaliduser']
         if not invaliduser:
             return ()