diff --git a/src/models/shop/ShopPuzzle.ts b/src/models/shop/ShopPuzzle.ts
index 3969f88..250e51e 100644
--- a/src/models/shop/ShopPuzzle.ts
+++ b/src/models/shop/ShopPuzzle.ts
@@ -94,7 +94,7 @@ export class ShopPuzzleClass extends BaseModule {
     if (sub_tag) {
       opt.sub_tag = sub_tag
     }
-    if (groups) {
+    if (groups && groups.length > 0) {
       Object.assign(opt, { groups: { $in: groups } })
     }
     if (quality != undefined) {