Access denied by pushing a task to another column

Kanboard is running on a apache2, with php 7.3.3, maria-db 5.5.68 (mysql 15.1).

If I push a task per drag and drop on the pinboard, the alert dialog says: Access denied. I can move the task in list view without problems.

Have sombody any idea? I don’t find something!

do you have any plugins installed?
you can enable kanboard debug mode and maybe get some information on what’s going wrong.

Thanks Chaosmeister,
I find out, that the plugin Backlog makes this problem. After removing the plugin, it works still normal now.

But I don’t see in the debug.log, what the problem is.

My sugesstion is, that it must be the java.component. Ok, I tell it in gitlab.