diff --git a/apps/wpm/serializers.py b/apps/wpm/serializers.py
index 0ddded68..2f20ddad 100644
--- a/apps/wpm/serializers.py
+++ b/apps/wpm/serializers.py
@@ -122,14 +122,15 @@ class MlogSerializer(CustomModelSerializer):
         return super().update(instance, validated_data)
 
     def validate(self, attrs):
-        mtask = attrs['mtask']
-        handle_date = attrs['handle_date']
-        if handle_date >= mtask.start_date and handle_date <= mtask.end_date:
-            pass
-        else:
-            raise ValidationError('操作日期错误')
-        if mtask.state != Mtask.MTASK_ASSGINED:
-            raise ValidationError(f'{mtask.mgroup.name}_不可提交日志!')
+        mtask = attrs.get('mtask', None)
+        if mtask:
+            handle_date = attrs['handle_date']
+            if handle_date >= mtask.start_date and handle_date <= mtask.end_date:
+                pass
+            else:
+                raise ValidationError('操作日期错误')
+            if mtask.state != Mtask.MTASK_ASSGINED:
+                raise ValidationError(f'{mtask.mgroup.name}_不可提交日志!')
         return attrs