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PHP Warningyii\base\ErrorException

Invalid argument supplied for foreach()

$_GET = [
    'ProductFilter' => [
        'searchterm' => 't�zk�bel',
    ],
];

$_SESSION = [
    '__flash' => [],
    '__returnUrl' => 'https://pauer-land.hu/?oldal=14&q=t%EF%BF%BDzk%EF%BF%BDbel',
];