Fatal error: Uncaught TypeError: Substitution::getSubstitutionsBySubstitute(): Argument #1 ($teacherId) must be of type int, null given, called in /home/proyectosevg/public_html/01/guardias/app/controllers/TeacherController.php on line 291 and defined in /home/proyectosevg/public_html/01/guardias/app/models/Substitution.php:34 Stack trace: #0 /home/proyectosevg/public_html/01/guardias/app/controllers/TeacherController.php(291): Substitution->getSubstitutionsBySubstitute(NULL) #1 /home/proyectosevg/public_html/01/guardias/public/index.php(52): TeacherController->substitutions() #2 {main} thrown in /home/proyectosevg/public_html/01/guardias/app/models/Substitution.php on line 34