Generic Camera and D-Link DCS-4802E crashes because no microphone?

Hello,

Have anyone experience in setting up a generic camera for D-Link DCS-4802E?
I am using the RTSP protocol.
The preview works, however, when i click on it it crashes with the following error message:

I interpret this as it cannot find the sound stream, which could be the case since the camera doesn’t have a microphone.

Is there anything you can do to fix this? Can you disable sound for a camera?
Thanks in advance!