Core/GameObjects: validate gameobject rotation on startup

src/server/game/Globals/ObjectMgr.cpp

@@ -2536,6 +2536,12 @@ void ObjectMgr::LoadGameObjects()
             continue;
         }
 
+        if (!data.rotation.isUnit())
+        {
+            TC_LOG_ERROR("sql.sql", "Table `gameobject` has gameobject (GUID: %u Entry: %u) with invalid rotation quaternion (non-unit), defaulting to orientation on Z axis only", guid, data.id);
+            data.rotation = QuaternionData::fromEulerAnglesZYX(data.spawnPoint.GetOrientation(), 0.0f, 0.0f);
+        }
+
         if (sWorld->getBoolConfig(CONFIG_CALCULATE_GAMEOBJECT_ZONE_AREA_DATA))
         {
             uint32 zoneId = 0;