authentication - all of a sudden Laravel 5.1 can't retrieve logged user -

i don't know happened here, of sudden, out of blue code

return \auth::user(); 

after loggin user in isn't fetching anything. if echo $id = \auth::user()->id; "errorexception in usercontroller.php line 20: trying property of non-object" error. thing did before happened inserting:

event::listen('illuminate.query', function($query) {     var_dump($query); }); 

in routes display sql queries, , removing doesn't cure.