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PHP Noticeyii\base\ErrorException

Undefined index: pageTitle

$_GET = [
    'lang' => 'en',
    'Theses_sort' => 'author',
    'Theses_page' => '4',
];

$_SESSION = [
    '__flash' => [],
    'prevUrl' => '',
    'curUrl' => '/en/theses/abstracts',
    'prevLang' => 'en',
];