500 Internal server error only for Talk module

Hello, community!

The error started a week ago I guess because of updates tough I really don’t understand since it only manifests in Talk Module. The rest is working properly. I really have no idea where this error comes from. So if anybody has any clue why, when visiting talk web interface, I get the infamous 500 internal server error, just throw me a bone here.

Nextcloud version: 15.0.4
Operating system and version: CentOS Linux release 7.6.1810 (Core)
Apache and nginx version (proxy) : nginx 1.1.42, apache 2.4.6
PHP version: 7.1.26

The output of your Apache system log in /var/log/:

[Mon Feb 25 16:48:44.584594 2019] [authz_core:error] [pid 23221] [client zzz.xxx. yyy.aaaa:41004] AH01630: client denied by server configuration: /home/user/web/cloud.domain.tld/public_html/data/.ocdata

I will provide any other logs if required for further debugging. Tnx in advance!