Segmentation fault on rebuild_index

I have a rather large index of several hundred thousand records.

Currently I am unable to rebuild my index because it results in a
segfault after maybe 10 minutes.

/var/lib/gems/1.8/gems/acts_as_ferret-0.4.1/lib/multi_index.rb:27: [BUG]
Segmentation fault

This may have occured as a result of searching the index during a
rebuild, I’m not sure.