Right, so this is more of a technical problem involving a planet "owned" by 2 races at once, myself and my "allies." And yes, I know you shouldn't don't post bugs when you use designer mode but this is me asking for some help, not reporting a bug.
After my allies had their homeworld and all but 5 of their ships eaten by the Invaders I declared war on them to get them to surrender their few assets to me, like a couple mining colonies. This would've gone well except the only place that had anybody or anything on it owned by them wouldn't budge. All it was were 20 mines and some garrison battalions, even after years of bombardment and ground battles they refused to give up. Instead, I fire up designer mode and try to force them to join me, if only so I could abandon their colonies after taking what they had stored in them.
Surprisingly, this worked for the most part. They had an Alpha Centauri ruin claimed (which I also had claimed) as well as 2 others in the Gliese 109 system, their former homeworld and that mining colony, which I also have colonies on. I abandon their half (their race is called Agmar, by the way) of the mining colony without issue, but the homeworld is where it gets me.
First, I have 3 new governors not of my race because I transferred all their things to me. I can't force them to retire but I can replace them. They produce a name related error each time I tried to open the colony summary screen because the Agmar half of the homeworld was run by a non-existant governor. I replace this guy with one of my governors and he gets booted from the spot and the position opens 1 30-day increment later. Strange stuff. It still gives me an error, actually. "Error in GetCommanderName
Error 94 was generated by Aurora
Invalid use of Null"
This is the annoying part, I can't abandon the homeworld. This wouldn't be all too aggravating except my civilians try to load trade goods that aren't being produced by the colony because the entire population died in a nuclear bombardment. When I do try to abandon the Agmar ghost colony, I get an error that opens itself infinitely and can only be resolved by force-closing Aurora through the task manager.
"Error in cmdDelete_Click
Error 3420 was generated by DAO.Recordset
Object invalid or no longer set."
EDIT: Nevermind, frakk all of this. They built a random new colony somewhere with nobody on it so I just gave their half of the colony back and deleted it from their end.