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Coding error detected, it must be fixed by a programmer: moodle_database::get_in_or_equal() does not accept empty arrays

Debug info:
Error code: codingerror

Stack trace:

line 770 of /lib/dml/moodle_database.php: coding_exception thrown
line 112 of /mod/forum/classes/local/vaults/author.php: call to moodle_database->get_in_or_equal()
line 261 of /mod/forum/classes/local/builders/exported_posts.php: call to mod_forum\local\vaults\author->get_context_ids_for_author_ids()
line 140 of /mod/forum/classes/local/builders/exported_posts.php: call to mod_forum\local\builders\exported_posts->get_author_context_ids()
line 98 of /mod/forum/classes/local/renderers/posts.php: call to mod_forum\local\builders\exported_posts->build()
line 210 of /mod/forum/classes/local/renderers/discussion.php: call to mod_forum\local\renderers\posts->render()
line 340 of /mod/forum/discuss.php: call to mod_forum\local\renderers\discussion->render()