diff --git a/server/gameserver/incubator.cc b/server/gameserver/incubator.cc
index 10de443b..c0ba5299 100644
--- a/server/gameserver/incubator.cc
+++ b/server/gameserver/incubator.cc
@@ -658,12 +658,26 @@ void Incubator::Rearrangement()
 
 void Incubator::StartNewBattleMode()
 {
+    Player* selected_player = nullptr;
+    room->TraversePlayerList
+        (
+         [&selected_player] (Player* hum) -> bool
+         {
+             selected_player = hum;
+             return false;
+         });
+    if (!selected_player) {
+        return;
+    }
     room->xtimer.SetIntervalWpEx
         (
          SERVER_FRAME_RATE * (3 + rand() % 2),
-         [this] (int event, const a8::Args* args)
+         [this, selected_player] (int event, const a8::Args* args)
          {
              if (a8::TIMER_EXEC_EVENT == event) {
+                 if (room->IsGameOver()) {
+                     return;
+                 }
              }
          },
          &xtimer_attacher_);