GLOBALS:

Array
(
    [_GET] => Array
        (
            [route] => courses/php7-i-mysql-sredniy-uroven/урок-4/ubuntu-postfix-dovecot-squirrelmail
            [_module] => courses
            [_page] => lesson
            [key] => php7-i-mysql-sredniy-uroven
            [id] => урок-4
            [title] => ubuntu-postfix-dovecot-squirrelmail
        )

    [_POST] => Array
        (
        )

    [_COOKIE] => Array
        (
        )

    [_FILES] => Array
        (
        )

    [_SERVER] => Array
        (
            [REDIRECT_UNIQUE_ID] => YIGz8LI52n8AAFCejNkAAAAK
            [REDIRECT_HTTPS] => on
            [REDIRECT_SSL_TLS_SNI] => school-php.com
            [REDIRECT_STATUS] => 200
            [UNIQUE_ID] => YIGz8LI52n8AAFCejNkAAAAK
            [HTTPS] => on
            [SSL_TLS_SNI] => school-php.com
            [SSL_SERVER_S_DN_CN] => school-php.com
            [SSL_SERVER_I_DN_C] => US
            [SSL_SERVER_I_DN_O] => Let's Encrypt
            [SSL_SERVER_I_DN_CN] => R3
            [SSL_SERVER_SAN_DNS_0] => school-php.com
            [SSL_VERSION_INTERFACE] => mod_ssl/2.4.25
            [SSL_VERSION_LIBRARY] => OpenSSL/1.0.2l
            [SSL_PROTOCOL] => TLSv1.2
            [SSL_SECURE_RENEG] => true
            [SSL_COMPRESS_METHOD] => NULL
            [SSL_CIPHER] => ECDHE-RSA-AES128-GCM-SHA256
            [SSL_CIPHER_EXPORT] => false
            [SSL_CIPHER_USEKEYSIZE] => 128
            [SSL_CIPHER_ALGKEYSIZE] => 128
            [SSL_CLIENT_VERIFY] => NONE
            [SSL_SERVER_M_VERSION] => 3
            [SSL_SERVER_M_SERIAL] => 0419F73DFBDA5B55B2B102611B4CFF9E9EF9
            [SSL_SERVER_V_START] => Mar 12 21:43:27 2021 GMT
            [SSL_SERVER_V_END] => Jun 10 21:43:27 2021 GMT
            [SSL_SERVER_S_DN] => CN=school-php.com
            [SSL_SERVER_I_DN] => CN=R3,O=Let's Encrypt,C=US
            [SSL_SERVER_A_KEY] => rsaEncryption
            [SSL_SERVER_A_SIG] => sha256WithRSAEncryption
            [SSL_SESSION_ID] => 37fb0816fc30a818350b08227f298300941076a51749d2064e75dd7fa3d48708
            [SSL_SESSION_RESUMED] => Initial
            [HTTP_HOST] => school-php.com
            [HTTP_CONNECTION] => Keep-Alive
            [HTTP_ACCEPT_ENCODING] => gzip
            [HTTP_CF_IPCOUNTRY] => US
            [HTTP_X_FORWARDED_FOR] => 100.25.42.117
            [HTTP_CF_RAY] => 64409c405d1b4e8c-FRA
            [HTTP_X_FORWARDED_PROTO] => https
            [HTTP_CF_VISITOR] => {"scheme":"https"}
            [HTTP_USER_AGENT] => CCBot/2.0 (https://commoncrawl.org/faq/)
            [HTTP_ACCEPT] => text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
            [HTTP_ACCEPT_LANGUAGE] => en-US,en;q=0.5
            [HTTP_IF_MODIFIED_SINCE] => Fri, 22 Jan 2021 19:18:53 GMT
            [HTTP_CF_CONNECTING_IP] => 100.25.42.117
            [HTTP_CDN_LOOP] => cloudflare
            [HTTP_CF_REQUEST_ID] => 099c3ffc3300004e8c9c9a3000000001
            [PATH] => /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin
            [SERVER_SIGNATURE] => 
            [SERVER_SOFTWARE] => School-PHP
            [SERVER_NAME] => school-php.com
            [SERVER_ADDR] => 178.57.218.127
            [SERVER_PORT] => 443
            [REMOTE_ADDR] => 162.158.92.137
            [DOCUMENT_ROOT] => /var/www/school-php.com/public_html
            [REQUEST_SCHEME] => https
            [CONTEXT_PREFIX] => 
            [CONTEXT_DOCUMENT_ROOT] => /var/www/school-php.com/public_html
            [SERVER_ADMIN] => admin@school-php.com
            [SCRIPT_FILENAME] => /var/www/school-php.com/public_html/index.php
            [REMOTE_PORT] => 59418
            [REDIRECT_URL] => /courses/php7-i-mysql-sredniy-uroven/урок-4/ubuntu-postfix-dovecot-squirrelmail
            [REDIRECT_QUERY_STRING] => route=courses/php7-i-mysql-sredniy-uroven/урок-4/ubuntu-postfix-dovecot-squirrelmail
            [GATEWAY_INTERFACE] => CGI/1.1
            [SERVER_PROTOCOL] => HTTP/1.1
            [REQUEST_METHOD] => GET
            [QUERY_STRING] => route=courses/php7-i-mysql-sredniy-uroven/урок-4/ubuntu-postfix-dovecot-squirrelmail
            [REQUEST_URI] => /courses/php7-i-mysql-sredniy-uroven/%D1%83%D1%80%D0%BE%D0%BA-4/ubuntu-postfix-dovecot-squirrelmail
            [SCRIPT_NAME] => /index.php
            [PHP_SELF] => /index.php
            [REQUEST_TIME_FLOAT] => 1619112944.8859
            [REQUEST_TIME] => 1619112944
        )

    [t] => 1619112944.8973
    [GLOBALS] => Array
 *RECURSION*
    [_SESSION] => Array
        (
            [antixsrf] => 8b7a2fed3415ee14508807f4224ed0da
        )

)

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-4/ubuntu-postfix-dovecot-squirrelmail) called at [/var/www/school-php.com/public_html/index.php:245]

TIPS

Незадокументированный тип ошибки