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PHP Warningyii\base\ErrorException

Invalid argument supplied for foreach()

$_GET = [
    'ProductFilter' => [
        'searchterm' => 'mire j� a red buster hajfest�k',
    ],
];

$_SESSION = [
    '__flash' => [],
    '__returnUrl' => 'https://www.szepsegklinika.hu/?oldal=14&q=mire+j%EF%BF%BD+a+red+buster+hajfest%EF%BF%BDk&hol=1',
];