diff --git a/sync-keys.js b/sync-keys.js
index 46ae51f..2df580e 100644
--- a/sync-keys.js
+++ b/sync-keys.js
@@ -162,8 +162,8 @@ const mongoose = require("/app/code/librechat/node_modules/mongoose");
     // image MCP credential
     const encImage = await encrypt(sk);
     await auths.updateOne(
-      { userId: uid, pluginKey: MCP_PLUGIN_KEY, authField: MCP_AUTH_FIELD },
-      { $set: { userId: uid, pluginKey: MCP_PLUGIN_KEY, authField: MCP_AUTH_FIELD, value: encImage } },
+      { userId: String(uid), pluginKey: MCP_PLUGIN_KEY, authField: MCP_AUTH_FIELD },
+      { $set: { userId: String(uid), pluginKey: MCP_PLUGIN_KEY, authField: MCP_AUTH_FIELD, value: encImage } },
       { upsert: true }
     );
     seeded++;