Warning: Trying to access array offset on null in /home/zzvzmkqw/domains/adc.ac.zw/public_html/school.php on line 22

Fatal error: Uncaught TypeError: School::RetrieveTeacherProducts(): Argument #1 ($teacherId) must be of type int, null given, called in /home/zzvzmkqw/domains/adc.ac.zw/public_html/school.php on line 22 and defined in /home/zzvzmkqw/domains/adc.ac.zw/public_html/DB/schools_controller.php:47 Stack trace: #0 /home/zzvzmkqw/domains/adc.ac.zw/public_html/school.php(22): School->RetrieveTeacherProducts() #1 {main} thrown in /home/zzvzmkqw/domains/adc.ac.zw/public_html/DB/schools_controller.php on line 47