diff --git a/app/api/history.py b/app/api/history.py
index f6c2993..a206fe5 100644
--- a/app/api/history.py
+++ b/app/api/history.py
@@ -48,6 +48,10 @@ async def search_history(history: HistorySearchIn) -> HistorySearchOut:
         for date, users in data.items():
             for user, records in users.items():
                 record = await Config.merge_statistic_info(records)
+                # 安全检查：确保 index 字段存在
+                if "index" not in record:
+                    logger.warning(f"合并统计信息缺少 index 字段，用户: {user}, 日期: {date}")
+                    record["index"] = []
                 record["index"] = [HistoryIndexItem(**_) for _ in record["index"]]
                 record = HistoryData(**record)
                 data[date][user] = record
diff --git a/app/core/config.py b/app/core/config.py
index c7c1857..b36de0c 100644
--- a/app/core/config.py
+++ b/app/core/config.py
@@ -2272,7 +2272,12 @@ class AppConfig(GlobalConfig):
 
         logger.success(f"统计信息合并完成, 共计 {len(data['index'])} 条记录")
 
-        return {k: v for k, v in data.items() if v}
+        # 确保返回的字典始终包含 index 字段，即使为空
+        result = {k: v for k, v in data.items() if v}
+        if "index" not in result:
+            result["index"] = []
+
+        return result
 
     async def search_history(self, mode: str, start_date: date, end_date: date) -> dict:
         """