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The TF Learn menu "courses" is unfortunately broken. It will display all courses properly, but when I click on the link for the course I get a 404 not found error.

Also, the following error appears:

1064 You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'AND `published` = '1' ORDER BY ordering ASC' at line 3 

Looking forward to the bug fix. Thank you.

Please edit the courses and check if there are any modules which are empty.

In case this doesn't solves, please share the source of error by enabling debug mode in global configuration.

Thank you

That was it. There was an empty module in the course.

Thank you for your help!