Seems to be fixed for me with dev-version 1.03.110511, played a few hours early in the morning. Or could this be just me being lucky? But i had the issue with 1.02 before too.

This is a duplicate of #0000238

After replaying the mission and creating a autosave again it worked fine. I was NOT able to reproduce a false autosave. So it seems that the error is in the saving, not the loading. Anyway the game should not crash if it gets a false savegame.
Unfortunatly I was not able to upload the first false autosave, because the filetype is not allowed.
Btw. it was the first autosave created on my computer, I dont know if this is relevant.