diff --git a/webapp/services/BattleBoxService.php b/webapp/services/BattleBoxService.php
index 6829b5b1..e7f9dc40 100644
--- a/webapp/services/BattleBoxService.php
+++ b/webapp/services/BattleBoxService.php
@@ -96,7 +96,7 @@ class BattleBoxService {
                 self::setDailyPhaseAllocNum($currPhase, myself()->_getNowDaySeconds(), $allocableNum);
             }
         } else {
-
+            $allocableNum = max(0, $allocableNum - $alreadyAllocNum);
         }
         if ($allocableNum > 0) {
             $lstVal = mt\Parameter::getListValue('battle_event_loot_per_game');