Error

PHP Noticeyii\base\ErrorException

Undefined index: render_data

$_GET = [
    'lang' => 'az',
    'year' => '2018',
    'audience' => 'buraxilis-9',
    'inner' => 'dinamika-sınaq',
    'inner2' => 'a-variantı',
];

$_SESSION = [
    '__flash' => [],
    'language.lang' => 'az',
    'usid' => '660693ce494981711707086',
    'return_count' => 1,
    'exam_func' => 'generateDynamicExam',
    'exam_params' => [
        2,
        5,
        91,
    ],
];