The PC version was patched, & I believe I've played a patched Amiga version but I don't know if the Atari version got a patch.
Luckily I seem to have found a workable solution. By deploying all machines I'm able to trade ships again & resume normal play, except for being stuck with any machines I buy because the game will crash again when I try to sell them. But as I can still make progress that's no big deal.