Nextcloud 14.0.1.1 - Firefox problem

Since the last update, I always get the message "This version of Nextcloud is not compatible with Firefox. Use another browser "

Nextcloud version 14.0.1.1
Operating system and version Ubuntu 18.04
Apache or nginx version nginx/1.13.8
PHP version 7.2.10

Why is Nextcloud, no longer compatible with Firefox?

If I’ve seen this correctly, Firefox on a Mac works fine.
But under Windows, just not.

User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:62.0) Gecko/20100101 Firefox/62.0

LOG:

Undefined index: HTTP_USER_AGENT at /var/www/nextcloud/apps/initialcheck/check/check_sample.php.dist#27

The output of your Apache/nginx/system log in /var/log/nginx/nextcloud.access.log:

 [26/Sep/2018:15:51:53 +0200] "GET / HTTP/2.0" 500 81 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:62.0) Gecko/20100101 Firefox/62.0" "-" "domain.de" sn="domain.de" rt=0.055 ua="unix:/run/php/php7.2-fpm.sock" us="500" ut="0.055" ul="100" cs=BYPASS

Has been solved, it is up to the “InitialCheck” APP

I don’t get it. Was I to go to the terminal and make this change from what I have [ from what I have check_ sample.php.dist to check_sample.php.dist#27] Because I tried that restarted the network and restarted the server. and that did not work. What was the Solution here for this. [ This version of Nextcloud is not compatible with Firefox. Use another browser ]