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PHP Noticeyii\base\ErrorException

unserialize(): Error at offset 0 of 50132 bytes

$_GET = [
    'r' => 'calendar%2Fview%2Findex',
    'cguid' => '60751700-80b9-43a6-a16b-346edba51ced',
];

Warning: Invalid argument supplied for foreach() in /var/www/humhub-1.4.0/protected/humhub/components/ModuleManager.php on line 257