added null check for setupMainStage in UI
added null check for setupMainStage in UI

Honoo/HubTurbo,HyungJon/HubTurbo,Sumei1009/HubTurbo,ianngiaw/HubTurbo,HyungJon/HubTurbo,gaieepo/HubTurbo,gaieepo/HubTurbo,ianngiaw/HubTurbo,saav/HubTurbo,Honoo/HubTurbo,Sumei1009/HubTurbo,saav/HubTurbo