Photos keeps crashing while editing RAW files

As a Test:

Hold down the option (or alt) key and launch Photos. From the resulting menu select 'Create Library' 

Import a few pics into this new, blank library. Is the Problem repeated there?

Post back with the result.

(You can return to your original library simply by holding the option key when launching and choosing it.)

If it's only happening on some images the issue might be with the images. Try this. Select one of them and export the original

File -> Export -> Export Unmodified Original

Rename the file and then re-import it. Can you edit that?

Raws from which camera?

Do it recur when you go back to your main library? If so where is that library stored?