活动：修改活动bug

game-server/app/servers/activity/handler/limitPackageHandler.ts

@@ -91,6 +91,9 @@ export class LimitPackageHandler {
         }
 
         let item = playerData.findItem(id);
+        if (!item) {
+            return resResult(STATUS.ACTIVITY_ID_ERROR);
+        }
         if (item.countMax > 0 && item.buyCount >= item.countMax) {
             return resResult(STATUS.ACTIVITY_MAX_COUNT);
         }