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PHP Noticeyii\base\ErrorException

Trying to get property 'cate_id' of non-object

$_GET = [
    'title' => 'ngon-ngu',
    'slug' => 'L2RpY2gtdGh1YXQtcGhpZW4tZGljaC1kaWNoLXRodWF0LWNvbmctY2h1bmctZGljaC1jb25nLWNodW5nL2RpY2gtdGllbmctZHVjLmh0bWwmYW1wO2xhbmc9dm4=',
];