diff --git a/game-server/app/services/expeditionService.ts b/game-server/app/services/expeditionService.ts
index 82dab89f7..55327ab3f 100644
--- a/game-server/app/services/expeditionService.ts
+++ b/game-server/app/services/expeditionService.ts
@@ -111,7 +111,7 @@ export async function matchRobots(scale: number, myCe: number, robotCe: number,
                 }
                 let ce = 0;
                 for(let attrName in attribute) {
-                    ce += attribute[attrName] * getAttrCeRatio(attrName);
+                    ce += attribute[attrName] * getAttrCeRatio(attrName)||0;
                 }
                 enemyObj.enemies.push({...enemy, attribute, lv});
                 allCe += ce;