Hi guys,
discovered an error in the JS-SDK: when trying to permanently log my user in (using Facebook) the “stayLoggedIn” flagged is set to “true” in local storage, regardless if it’s successfull.
Problem: If you want to get the current user and the “stayLoggedIn” flag is set, the SDK supposes that the “current-user-id” is also set (which is not the case with an unsuccessful login), hence sending a user findById with an “undefined” userId, which throws an error.
Please fix 
thanks,
Martin
Hi Martin,
thank you for noticing this issue! It will be fixed in next version. 
Regards,
Stanislav