als ik de achtergrond wil bewerken stopt het programma lightroom

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Google translation: "When I want to edit the background, the Lightroom program stops."

Do you mean that when you try to add a Background mask, the program stops?

If so, most problems with LR's AI commands are caused by older, buggy graphics drivers. Try updating your graphics driver by going directly to the manufacturer's web site:
https://helpx.adobe.com/lightroom-classic/kb/troubleshoot-gpu.html#solution-4

If that doesn't help, please copy/paste here the entire contents of the LR menu command Help > System Info -- that will let us see exactly which versions of hardware and software LR thinks you're running.

If your issue is something else, please provide much more detail about which commands you are giving. Full-resolution screenshots (not phone pics) of the entire LR window are often quite helpful.