Clicking "Render animation" crashes blender immediately, but "Render" works just fine

Strange issue. Basically it will render FINE (with F12)
But If i try to render animation it instantly closes down blender.

To be clear - it’s not an issue with my system. It will render fine, but I need it to render animation!
Blender version is 2.90.1

Did you try launching blender from a terminal window and seeing if there is any message after it shuts down?

And everthing is fine with your output settings? Codec, path, available disk space, write permission… ?