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PHP Warningyii\base\ErrorException

Invalid argument supplied for foreach()

$_GET = [
    'ProductFilter' => [
        'searchterm' => 'bmw von�horog can bus bekotese',
    ],
];

$_SESSION = [
    '__flash' => [],
    '__returnUrl' => 'https://vonohorog-bolt.hu/?oldal=14&q=bmw+von%EF%BF%BDhorog+can+bus+bekotese',
];