Fixed a bug with signing in (thanks to @slothfulmedia).
Fixed stats of crawlers' visits (i.e. GoogleBot, Bing Bot) could not be saved.
2FA users may still experience troubles signing in due to a different bug with Gmail SMTP, which we use to send messages. Other emails, such as password recovery codes and digests, can't be sent for this reason, too. I gave @michaelplzno a solution and we'll fix this issue soon.