diff --git a/game-server/app/services/normalBattleService.ts b/game-server/app/services/normalBattleService.ts
index 167ed77e2..d66476124 100644
--- a/game-server/app/services/normalBattleService.ts
+++ b/game-server/app/services/normalBattleService.ts
@@ -122,7 +122,8 @@ export function calculateWarStar(warStar: WarStar[] = [], battleId: number, star
     let hasFound = false;
     for(let curWarStar of warStar) {
         if(curWarStar.id == battleId) {
-            newStars = uniq([...stars, ...curWarStar.stars]);
+            let oldStars = curWarStar.stars||[];
+            newStars = uniq([...stars, ...oldStars]);
             newStar = newStars.filter(cur => cur > 0).length;
             newWarStars.push({...curWarStar, star: newStar, stars: newStars});
             hasFound = true;