Make it impossible to save a custom post type with both video and image selected?

I have a custom post type, which creates a slide. I can select if I want to have an image or a video, with two different buttons. If I select both of them it will still save, but the background will show up. How do I make it impossible to save/publish if both an image and a video is selected?

I don’t really know what code to provide, as it is code in the post-details.php file + functions.php and the javascript-files.

Is there any easy way to prevent this?

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