NullReferenceException when saving the game (maybe new bug?)

[MoreUmpf]

As of 0.90 you are now able to remove Kerbals from the roster. I accidentally killed Jeb (shame on me ) so I removed him from the roster. When I tried to do a quicksave I got a NullReferenceException(in the debug log) which pointed at KSPAchievements, so I looked into the save file and searched for the ProgressTracking node. Seems like I completed some achievements with Jeb and maybe because of this the game tries to read some data from Jeb when saving the game but fails because I removed Jeb from the list.

Is this a new bug or maybe a conversion problem because I played on an older save?

Also is there a way to fix this because I can't save my game anymore .

[Claw]

Yes, this bug was discovered yesterday. You can check here for a short term fix:

http://forum.kerbalspaceprogram.com/threads/103205-0-90-Career-has-entered-a-state-where-menu-building-options-are-not-responsive?p=1606896&viewfull=1#post1606896

I will (hopefully soon) start working on something a bit better to address this bug, but hopefully this will help you for the time being.

Cheers,

-Claw