Fatal Error - none trigger related

Hi and sorry for posting a none-trigger related post here. But I want a quick answer
(this forum got the most viewers at this moment) and I don't know where else to post this.

The Fatal error occur when I upgrade a Circle of Power to a Orc Burrow or a Watch Tower after that I cancle it.
When I try to re-upgrade to a Orc Burrow or a Watch Tower the error accur.

Please find a good sulution for this, I already have two and im not quite happy about it.

If you're playing a custom map, anything could cause that. Since we don't know that custom map, we don't know the error.

Post the map...

I think I know why the fatal error accur, Its when you got more then 1 building that you can upgrade to with same building, so i tried to change the Orc Burrow and Watch Tower to a unit and it worked perfect. ( Maybe there is another way of fixing this, because now the buildings isn't really a building.)

I will post a demo map so that you may test it.

Just know that we can't and won't help you if we have no idea what's causing it... Post a section of the code then? -_-

Now please can any one find the sulution of this?

Here is the demo map of the problem.