diff --git a/packages/service/core/chat/saveChat.ts b/packages/service/core/chat/saveChat.ts
index 9c1321924..f427a40b1 100644
--- a/packages/service/core/chat/saveChat.ts
+++ b/packages/service/core/chat/saveChat.ts
@@ -313,8 +313,10 @@ export async function saveChat(props: Props) {
             shareId,
             outLinkUid,
             metadata: metadataUpdate,
-            createTime: new Date(),
             updateTime: new Date()
+          },
+          $setOnInsert: {
+            createTime: new Date()
           }
         },
         {