3 times in a row and it takes almost 30m to get there so im not going to try again, in the last part of the mission, It seems to happen as soon as the 2nd wave of bombers is killed.
Also the number of bombers is not show on screen, it says something like $bomber_count.
I just did a clean install with knossos for the 3rd attempt, same issue.
EDIT: to clearify, its not just a mission error, it crashes the game to desktop, whiout giving any error. Running default config, 3.8.0-3
Right before crash
EDIT2: USing 3.8.1 SSE2 fixed the issue.