At turn start, a notification box presented itself saying the Terran Resistance was giving up and surrendering all it's assets to me.  I accepted that.  Once that box cleared, a box underneath it was revealed in which the Terran Resistance was asking for negotiations to end the war.  I accepted that too and agreed to end the war, thinking it was strange that they wanted to negotiate after surrendering.  I did not get their planets, so I guess the surrender didn't go through.  I saved the game before end of turn and now I cannot load it without a crash.  Coincidence, or did the surrender and then negotiate cause a crash?