diff --git a/src/services/GameLogic.ts b/src/services/GameLogic.ts
index 4c1a82f..e907d54 100644
--- a/src/services/GameLogic.ts
+++ b/src/services/GameLogic.ts
@@ -37,7 +37,7 @@ export function transformRecord(records: any[]) {
 export function checkSubFinish(history: any, qid: string) {
   let count = 0
   for (let [key, val] of history.members) {
-    if (val.has(qid)) {
+    if (val.answer?.has(qid)) {
       count ++
     }
   }