diff --git a/game-server/app/services/checkParam.ts b/game-server/app/services/checkParam.ts
index dc2d96334..f2b27a4d1 100644
--- a/game-server/app/services/checkParam.ts
+++ b/game-server/app/services/checkParam.ts
@@ -744,7 +744,7 @@ export function checkRouteParam(route: string, msg: any) {
         case "battle.towerBattleHandler.sendTaskHero":
             {
                 let { batchCode, tasks } = msg;
-                if(!checkNaturalStrings(batchCode)) return false;
+                if(!checkStringIfExist(batchCode)) return false;
                 if(!checkNaturalArray(tasks)) return false;
                 for(let { taskCode, heroes } of tasks) {
                     if(!checkNaturalStrings(taskCode)) return false;