The payload is invalid

Hello,

I've upgraded 2 laravel applications on 5.4 few months ago.

Those application were created on 5.1, and I've always follow the upgrade guide 1 month after any release publication.

Since 5.4, I often have this kind of error on POST request :

Illuminate\Contracts\Encryption\DecryptException·The payload is invalid

app/Http/Middleware/CheckForMaintenanceMode.php:43App\Http\Middleware\CheckForMaintenanceMode::handle   
             throw new HttpException(503);
        }
        return $next($request); //line 43
    }
}

I don't have it on webhook notifications, it's always made by user request (session modification, on entity modification, etc).

Thanks