Fix regression bug introduced by 1.8.0
Fix regression bug introduced by 1.8.0

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