Do not crash if invalid referrer_id is passed during signup
Do not crash if invalid referrer_id is passed during signup

ccqi/rmc,shakilkanji/rmc,duaayousif/rmc,shakilkanji/rmc,UWFlow/rmc,duaayousif/rmc,MichalKononenko/rmc,duaayousif/rmc,MichalKononenko/rmc,shakilkanji/rmc,ccqi/rmc,JGulbronson/rmc,UWFlow/rmc,MichalKononenko/rmc,MichalKononenko/rmc,JGulbronson/rmc,ccqi/rmc,sachdevs/rmc,sachdevs/rmc,rageandqq/rmc,JGulbronson/rmc,rageandqq/rmc,rageandqq/rmc,sachdevs/rmc,UWFlow/rmc,rageandqq/rmc,MichalKononenko/rmc,duaayousif/rmc,duaayousif/rmc,UWFlow/rmc,rageandqq/rmc,shakilkanji/rmc,sachdevs/rmc,shakilkanji/rmc,UWFlow/rmc,ccqi/rmc,sachdevs/rmc,ccqi/rmc,JGulbronson/rmc,JGulbronson/rmc