Laravel datetime on user row now updating

Im following a tutorial on adding a last visited feature to my app from here

https://medium.com/@grmcameron/implementing-last-visited-last-seen-in-laravel-237dbbed9027

Basically, add a middleware, add it to the $middlewareGroups in Kernel.php, add a datetime column

$table->dateTime('last_online')->nullable();

The middleware is as follows;

namespace App\Http\Middleware;
use Illuminate\Support\Facades\Auth;

use Closure;

class LastOnline
{
    public function handle($request, Closure $next)
    {
        if (!Auth::check()) {
            return $next($request);
        }

        $user = Auth::user();

        $user->update([
            'last_online' => new \DateTime(),
        ]);

        return $next($request);
    }
}

But for some reason, the column doesnt upload on each request.

If i dd($user) it returns the correct user, but no update at all and also no errors are generated.

Just nothing.

Any help would be greatly appreciated.

via Chebli Mohamed