by Peter Svec.
The question has answers. It's existing quiz used several years. The same problem have all teachers. In each course there is another problematic question ID. I found out, that there is no problem when I duplicate quiz which has questions in quiz context. When I use questions from course context, there is this error.
In this case the question 82794 belong to category of another course. This is really strange. We upgraded mariadb to higher version but this can't be the origin of the problem. There are two other instances of moodle on the same server without this problem.
In this case the question 82794 belong to category of another course. This is really strange. We upgraded mariadb to higher version but this can't be the origin of the problem. There are two other instances of moodle on the same server without this problem.