headers already sent in Err log

[berlin2123]

Describe the bug

Errors in the logs keep appearing as headers already sent.

Cannot modify header information - headers already sent by (output started at 
/var/www/html/nextcloud/3rdparty/sabre/http/lib/Sapi.php:130) at 
/var/www/html/nextcloud/3rdparty/sabre/http/lib/Sapi.php#70

Seems like the issue is related to this app.

Steps to reproduce

NC version 29.0.7, Contacts version 6.0.0

just check logs of nextcloud.

Expected behavior

no this err log

Actual behavior

this err log keep appearing

Contact version

6.0.0

Operating system

rockylinux 9

PHP engine version

8.2

Web server

apache

Database

mariadb

Additional info

No response