Fix crash when start button is repeatedly pressed
Fix crash when start button is repeatedly pressed

EVAST9919/osu,ppy/osu,naoey/osu,UselessToucan/osu,EVAST9919/osu,naoey/osu,DrabWeb/osu,peppy/osu,smoogipoo/osu,DrabWeb/osu,2yangk23/osu,peppy/osu,peppy/osu,peppy/osu-new,smoogipoo/osu,smoogipoo/osu,DrabWeb/osu,ZLima12/osu,2yangk23/osu,johnneijzen/osu,UselessToucan/osu,johnneijzen/osu,ppy/osu,ppy/osu,NeoAdonis/osu,NeoAdonis/osu,ZLima12/osu,smoogipooo/osu,UselessToucan/osu,naoey/osu,NeoAdonis/osu