diff --git a/webapp/services/RoomBattleDataService.php b/webapp/services/RoomBattleDataService.php
index 63a85f32..04dfe03e 100644
--- a/webapp/services/RoomBattleDataService.php
+++ b/webapp/services/RoomBattleDataService.php
@@ -54,7 +54,7 @@ class RoomBattleDataService extends BaseService {
                 $myTeamScore += $this->_calBattleScore($member);
             }
         }
-        $myTeamScoreAvg = $myTeamScore / $realUserNum;
+        $myTeamScoreAvg = $realUserNum > 0 ? $myTeamScore / $realUserNum : 0;
 //        $paramMeta = mt\Parameter::getVal('performance_score_range',0);
 //        $scoreParam = explode("|",$paramMeta);
 //        if (count($paramMeta) < 2){