'[2025-10-03 12:55:21] FATAL ERROR: Uncaught TypeError: Course::getCourseCategory(): Return value must be of type string, null returned in /home/klient.dhosting.pl/friq/maturalnesos.pl/public_html/classes/Course.php:394
Stack trace:
#0 /home/klient.dhosting.pl/friq/maturalnesos.pl/public_html/classes/Course.php(400): Course->getCourseCategory()
#1 [internal function]: Course::{closure}(Object(Course))
#2 /home/klient.dhosting.pl/friq/maturalnesos.pl/public_html/classes/Course.php(401): array_filter(Array, Object(Closure))
#3 /home/klient.dhosting.pl/friq/maturalnesos.pl/public_html/templates/sections/our_course_area_exam.php(12): Course::filterByCategory(Array, 'exam')
#4 /home/klient.dhosting.pl/friq/maturalnesos.pl/public_html/classes/Layout.php(11): include_once('/home/klient.dh...')
#5 /home/klient.dhosting.pl/friq/maturalnesos.pl/public_html/kursy-technikum-online.php(21): Layout::load(Array, Array)
#6 {main}
thrown -> /classes/Course.php:394'
