I can reproduce this in the latest nightly build. The problem is a division by zero error in simfab.cc at line 112. This appears to be as a result of prod being zero without any checks for this. I have not produced a patch to fix this because I am not clear on whether it is intended that prod may ever be zero (in which case, all that is needed is a simple check before trying to divide in line 112), or whether it is an error that prod may ever be zero, in which case some further consideration will be needed as to why it arises.
Prod is set to zero in line 1790 in simfab.cc in this saved game shortly after loading, which suggests a rounding error of some sort.