Error Login after update to 3.8.4

Milad,
I can recreate the issue on your site, but we're unsure what's actually causing it. There are other reports of issues with Facebook authentication with Joomla 3.8.4, but we've been unable to recreate the problem on our development sites.. though we're trying hard.

Can you Private Message me FTP and Joomla admin credentials to your site so we can investigate further? We'd like to get to the bottom of this as soon as possible, but are continuing to try to recreate locally as well.

You can PM me by clicking the mail icon under my name to the left.

Thanks,
Alex

Joseph,
Thank you so much for sending FTP access. We investigated thoroughly on your site and believe we have found and fixed the issue for you. We're going through manual and automated tests on our development sites to ensure the issue is fixed and doesn't cause any unexpected behavior, but so far, it's looking good.

Please test on your site and let us know if you see any issues. We'll be rolling out an update very soon with this fix for everyone, but would love to hear any feedback from you ahead of time.

Thanks,
Alex