Some maps do not have any phase lanes linking to the star. It seems silly to be able to set the Occupation victory on maps like these as there is no way to get to the occupied planet.
I think Occupation victory should either be disabled completely for maps like these, or at the very least have a note saying something to say there is no phase lane to the star so occupation victory will not work.
Such maps include: Ancient Gifts and Foreign Invasion. Will update when/if I/others find more.