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PHP Noticeyii\base\ErrorException

Trying to get property 'cate_id' of non-object

$_GET = [
    'title' => 'ngon-ngu',
    'slug' => 'L2Jhby1naWEtZGljaC10aHVhdC1iYW8tZ2lhLXBoaWVuLWRpY2gvYmFvLWdpYS1kaWNoLXRodWF0Lmh0bWwmYW1wO2xhbmc9ZW4=',
];