Warning: foreach() argument must be of type array|object, null given in /mnt/web402/c1/99/59692999/htdocs/tactical-gamers.eu/ilch_2.1.18/application/modules/training/controllers/Index.php on line 38

Fatal error: Uncaught TypeError: usort(): Argument #1 ($array) must be of type array, null given in /mnt/web402/c1/99/59692999/htdocs/tactical-gamers.eu/ilch_2.1.18/application/modules/training/controllers/Index.php:41
Stack trace:
#0 /mnt/web402/c1/99/59692999/htdocs/tactical-gamers.eu/ilch_2.1.18/application/modules/training/controllers/Index.php(41): usort(NULL, Object(Closure))
#1 /mnt/web402/c1/99/59692999/htdocs/tactical-gamers.eu/ilch_2.1.18/application/libraries/Ilch/Page.php(243): Modules\Training\Controllers\Index->indexAction()
#2 /mnt/web402/c1/99/59692999/htdocs/tactical-gamers.eu/ilch_2.1.18/application/libraries/Ilch/Page.php(137): Ilch\Page->loadController()
#3 /mnt/web402/c1/99/59692999/htdocs/tactical-gamers.eu/ilch_2.1.18/index.php(68): Ilch\Page->loadPage()
#4 {main}
  thrown in /mnt/web402/c1/99/59692999/htdocs/tactical-gamers.eu/ilch_2.1.18/application/modules/training/controllers/Index.php on line 41