I first noticed this when attempting to 'train crew' from the hire crew menu aboard Space Station 1, which would cause an error display and crash. With the same savegame, I am now getting it whenever I dock, as well. I suspect it's related to my captain leveling up, because he has the most XP out of all the crew, but I'm not actually sure. The error log is as follows:
0.3 Error #6 in 560:LEVELUP f:\Prospector\rlprospector\crew.bas
0.3 Error #6 in 560:LEVELUP f:\Prospector\rlprospector\crew.bas
0.3 Error #6 in 560:LEVELUP f:\Prospector\rlprospector\crew.bas
0.3 Error #6 in 560:LEVELUP f:\Prospector\rlprospector\crew.bas
0.3 Error #6 in 560:LEVELUP f:\Prospector\rlprospector\crew.bas
0.3 Error #12 in -1:LEVELUP f:\Prospector\rlprospector\crew.bas
0.3 Error #6 in 560:LEVELUP f:\Prospector\rlprospector\crew.bas
0.3 Error #6 in 560:LEVELUP f:\Prospector\rlprospector\crew.bas
0.3 Error #6 in 560:LEVELUP f:\Prospector\rlprospector\crew.bas
0.3 Error #6 in 560:LEVELUP f:\Prospector\rlprospector\crew.bas
If I get an address to send it to, I can e-mail the save as well.