laravel 5 setting session in middleware

I'm building a middleware to validate user token for mobile api. This is my middleware

public function handle($request, Closure $next, $guard = null)
{
    if(!$request->is('api/v1/login')){
        $driver = Driver::where('token',$request->token)->first();
        if(!$driver){
            return response()->json(['error' => 'invalid_credentials'], 401);    
        }else{
            $request->session()->put('mobileuser', $driver);
        }    
    }
    return $next($request);
}

This is my routes.php

Route::group(array('prefix' => 'api/v1','middleware' => ['my.token']), function()
{    
    Route::post('track/', array('as'=>'api.v1.track.update_position', 'uses'=>'Api\v1\DriverController@update_position'));

});

This is my kernel.php

protected $middlewareGroups = [
        'web' => [
            \App\Http\Middleware\EncryptCookies::class,
            \Illuminate\Cookie\Middleware\AddQueuedCookiesToResponse::class,
            \Illuminate\Session\Middleware\StartSession::class,
            \Illuminate\View\Middleware\ShareErrorsFromSession::class,
            \App\Http\Middleware\VerifyCsrfToken::class,
        ],

        'api' => [
            'throttle:60,1',
        ],
        'my.token' => [
            \App\Http\Middleware\DeliToken::class,
            \Illuminate\Session\Middleware\StartSession::class
        ]
    ];

Basically i want to validate the token sent in the url, and set session if validated.

But i got this error

RuntimeException in Request.php line 859:
Session store not set on request.

Please help, how do i achieve the above ? Thanks

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