diff --git a/admin/dashboard/blueprints/message_push.py b/admin/dashboard/blueprints/message_push.py
index 7c3464c..8ff1c1c 100644
--- a/admin/dashboard/blueprints/message_push.py
+++ b/admin/dashboard/blueprints/message_push.py
@@ -175,6 +175,10 @@ def update_task(task_id):
                 'message': '只能编辑草稿或已暂停状态的任务'
             })
         
+        # 确保 content_miniprogram 是 JSON 字符串
+        if 'content_miniprogram' in data and isinstance(data['content_miniprogram'], dict):
+            data['content_miniprogram'] = json.dumps(data['content_miniprogram'])
+        
         # 更新任务
         db.update_task(task_id, data)
         
@@ -183,7 +187,7 @@ def update_task(task_id):
             'log_id': f"log_{datetime.now().strftime('%Y%m%d%H%M%S')}",
             'task_id': task_id,
             'action': 'update',
-            'user_id': session.get('user_id'),
+            'user_id': session.get('username', 'admin'),  # 使用 admin 作为默认值
             'changes': data
         })