thanks for your report. I think this happens because you have polytomies in your input gene tree (maybe you used fasttree to generate them), for instance above the gene 91_31_0. SpeciesRax only supports binary trees.
It looks like my parser does not detect it, and then everything crashes. I will add a check in the next release to report a clean error message when this happens. Other users will likely get the same issue.
There is no good solution for dealing with polytomies so far. I suggest to either resolve them randomly or to discard the gene families that are not fully resolved.