Hi StefanU
Thanks for your reply and help!!
The following is the reply to question and version information.
●Is that something you usually do?
=>No, it first time.
●Does this happen after an update?
=>Not update to 21.1.20210521 yet.
Because worked from home during covid-19, I could not operate the server to update Egroupware.
●Which version (from Admin/Changelog and versions/Changelog)?
=>20.1.20210503
●Installation type (package installation, archive installation or git)?
=>package installation, update by by docker.
●Which module?
=>Infoloag and Tracking System
●Does the error occur after an update/upgrade?
=>Not update to 21.1.20210521 yet.
●During which action does the error occur?
=>In the forum content.
●Is the error reproducible?
=>Yes, step in the forum content
●Are there any references in the web server error log?
=>Sorry, I cannot access the server during work from home.
●Which database is used (MySQL/MariaDB or PostgreSQL)?
=>MariaDB
●Which web server is used (Apache or nginx (19.1 docker: on the host the reverse proxy!)?
=>Apache2.0
●Which version
=>Apache2.0