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PHP Warningyii\base\ErrorException

Invalid argument supplied for foreach()

$_GET = [
    'ProductFilter' => [
        'searchterm' => 'hilti te 14 fej',
    ],
];

$_SESSION = [
    '__flash' => [],
    '__returnUrl' => 'https://pauer-land.hu/?oldal=14&q=hilti%20te%2014%20fej&ufksz=146',
];