Web Login only possible after Password reset - solved

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Nextcloud version 15.0.5:
Operating system and version Ubuntu 16.04.6 LTS:
Apache or nginx version Apache 2.4.18:
PHP version 7.2.16:
Firefox version 66.0.2 (64-Bit):

The issue you are facing:
When starting my firefox and trying to login to my nextcloud web session the login screen gets cleared w/o and message and comes back with empty user/pw fields.
The only chance I currently have is doing a password reset using the same password and then I can login successfully. But this is only working within the same firefox tab I have done the password reset. Doing a logout and trying to login in a new tab has the same result w/o success.
This is obviously only a problem in firefox

Is this the first time you’ve seen this error? N:

Steps to replicate it:

  1. see above

Found solution for this problem. See https://github.com/nextcloud/server/issues/11149#issuecomment-420170076