fixed crash in map
fixed crash in map

zhouxh1023/LumixEngine,zhouxh1023/LumixEngine,galek/LumixEngine,JakubLukas/LumixEngine,JakubLukas/LumixEngine,galek/LumixEngine,gamedevforks/LumixEngine,JakubLukas/LumixEngine,gamedevforks/LumixEngine,dreamsxin/LuxEngine,dreamsxin/LuxEngine