Laravel 8中间件路由报错：未登录时如何避免ErrorException？

errorexception: get() method on model for [appuser] was called without specifying a column.

route::get('login', 'authlogincontroller@showloginform')->name('login');

// 比如，对于需要认证才能访问的路由Route::get('/admin', 'AdminController@index')->middleware('auth');