Delete obj if it is not successfully added to grid. More to fix.

src/server/game/Battlegrounds/Battleground.cpp

@@ -1454,7 +1454,11 @@ bool Battleground::AddObject(uint32 type, uint32 entry, float x, float y, float
     data.go_state       = 1;
 */
     // Add to world, so it can be later looked up from HashMapHolder
-    map->AddToMap(go);
+    if (!map->AddToMap(go))
+    {
+        delete go;
+        return false;
+    }
     m_BgObjects[type] = go->GetGUID();
     return true;
 }
@@ -1557,7 +1561,12 @@ Creature* Battleground::AddCreature(uint32 entry, uint32 type, uint32 teamval, f
     creature->SetSpeed(MOVE_WALK,  cinfo->speed_walk);
     creature->SetSpeed(MOVE_RUN,   cinfo->speed_run);
 
-    map->AddToMap(creature);
+    if (!map->AddToMap(creature))
+    {
+        delete creature;
+        return NULL;
+    }
+
     m_BgCreatures[type] = creature->GetGUID();
 
     if (respawntime)