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PHP Noticeyii\base\ErrorException

unserialize(): Error at offset 0 of 50132 bytes

$_GET = [
    'r' => 'polls/poll/show',
    'cguid' => '8d9b5680-2dd1-47e6-9c50-11e58acfad6c',
];

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