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PHP Noticeyii\base\ErrorException

Trying to get property 'cate_id' of non-object

$_GET = [
    'title' => 'tin-tuc',
    'slug' => 'hoi-thao-dai-hoc-danh-tieng-monash-uc-va-hoc-bong-den-10-000-aud220-trieu-dong',
];