diff --git a/server/gameserver/roomobstacle.cc b/server/gameserver/roomobstacle.cc
index baca6a5..32ec457 100644
--- a/server/gameserver/roomobstacle.cc
+++ b/server/gameserver/roomobstacle.cc
@@ -166,7 +166,9 @@ void RoomObstacle::UpdateTimerFunc()
             Explosion();
             Die(room);
             BroadcastFullState(room);
-            room->xtimer.DeleteTimer(room->xtimer.GetRunningTimer());
+            if (room->xtimer.GetRunningTimer()) {
+                room->xtimer.DeleteTimer(room->xtimer.GetRunningTimer());
+            }
         }
     } else {
         room->xtimer.DeleteTimer(room->xtimer.GetRunningTimer());