php - multiple session files are created on each request in laravel 5.2.* -

currently i'm working laravel 5.2.29. on each request new session file generated , old file not deleted.

config/session.php file

<?php return [     'driver' => env('session_driver', 'file'),     'lifetime' => 120,     'expire_on_close' => false,     'encrypt' => false,     'files' => storage_path('framework/sessions'),     'connection' => null,     'table' => 'sessions',     'lottery' => [2, 100],     'cookie' => 'laravel_session',     'path' => '/',     'domain' => null,     'secure' => false,     'http_only' => true, ]; 

i put routes inside middleware group 'web'

route::group(['middleware' => ['web']], function () {     //login     route::post('login', 'user\logincontroller@login');  }); 

why happens? how solve problem?

i have tried changing cookie name, previuosly in laravel 5.2.23 works fine downgrade project laravel 5.2.23 , tried not working.

someone me out solve this.

remove route::group , should remove duplicates. old session files, cleaned after time. leave alone.