fatal error on wiki with seperate groups and individual mode when logged in as student

Coding error detected, it must be fixed by a programmer: PHP catchable fatal error

More information about this error

Debug info: Argument 3 passed to core_renderer::single_select() must be an array, null given, called in /var/www/moodle/mod/wiki/renderer.php on line 404 and defined

Stack trace:

    line 359 of /lib/setuplib.php: coding_exception thrown

    line 1158 of /lib/outputrenderers.php: call to default_error_handler()

    line 404 of /mod/wiki/renderer.php: call to core_renderer->single_select()

    line 284 of /mod/wiki/pagelib.php: call to mod_wiki_renderer->wiki_print_subwiki_selector()

    line 279 of /mod/wiki/view.php: call to page_wiki_view->print_header()