GLOBALS:

Array
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            [_page] => lesson
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            [id] => урок-10
            [title] => foreign-key-cascade-set-null-restrict-no-action
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    [GLOBALS] => Array
 *RECURSION*
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)

DEBUG BACKTRACE

#0  FW\MyErrorHandler\MyErrorHandler::handler(2, Trying to access array offset on value of type null, /var/www/school-php.com/public_html/modules/courses/lesson.php, 295) called at [/var/www/school-php.com/public_html/modules/courses/lesson.php:295]
#1  require(/var/www/school-php.com/public_html/modules/courses/lesson.php) called at [/var/www/school-php.com/public_html/modules/courses/controller/controller.php:11]
#2  require(/var/www/school-php.com/public_html/modules/courses/controller/controller.php) called at [/var/www/school-php.com/public_html/index.php:215]
#3  FrontController::init(courses/php7-i-mysql-sredniy-uroven/урок-10/foreign-key-cascade-set-null-restrict-no-action) called at [/var/www/school-php.com/public_html/index.php:245]

TIPS

Незадокументированный тип ошибки