ErrorException试图获取非对象的属性“locale”

Exception Error when projects run on the local.Trying to get property 'locale' of non-object error found.I really don't know what is wrong.

public function __construct() {
    $this->global = Setting::first();
    App::setLocale($this->global->locale);
    Carbon::setLocale($this->global->locale);
    setlocale(LC_TIME,$this->global->locale.'_'.strtoupper($this->global->locale));
}

This code where 'locale' added.

Make var_dump(Setting::first());die(); in your __construct() method