core: fix #351

packages/hydrooj/package.json

@@ -1,6 +1,6 @@
 {
     "name": "hydrooj",
-    "version": "3.11.21",
+    "version": "3.11.22",
     "bin": "bin/hydrooj.js",
     "main": "src/loader",
     "module": "src/loader",

packages/hydrooj/src/model/user.ts

@@ -384,7 +384,7 @@ class UserModel {
     }
 
     static async listGroup(domainId: string, uid?: number) {
-        const groups = await collGroup.find(uid ? { domainId, uids: uid } : { domainId }).toArray();
+        const groups = await collGroup.find(typeof uid === 'number' ? { domainId, uids: uid } : { domainId }).toArray();
         if (uid) {
             groups.push({
                 _id: new ObjectID(), domainId, uids: [uid], name: uid.toString(),