Fix nil case (Windows)
Fix nil case (Windows)

webdev1001/byebug,edward/byebug,icebreaker/byebug,webdev1001/byebug,yui-knk/byebug,deivid-rodriguez/byebug,deivid-rodriguez/byebug,k0kubun/byebug,miamiruby/byebug,scalp42/byebug,scalp42/byebug,os97673/byebug,phusion/byebug,davidmowrer/in_class_projects_t2,yui-knk/byebug,ozydingo/byebug,guilherme/byebug,davidmowrer/in_class_projects_t2,edward/byebug,saisai/byebug,deivid-rodriguez/byebug,guilherme/byebug,k0kubun/byebug,miamiruby/byebug,guilherme/byebug,saisai/byebug,ozydingo/byebug,icebreaker/byebug,yui-knk/byebug,os97673/byebug,k0kubun/byebug,phusion/byebug,davidmowrer/in_class_projects_t2