I am working on code that includes bllipparser Python module, among other things. Feeding it the same dataset, it will intermittently crash (maybe once in three to ten runs). Going through lldb, I found that the public field weights of RerankerModel (source), that is apparently only set once (in the constructor), randomly becomes NULL (I only have one RerankerModel for the duration of my run, so there should be exactly one weights, that persists unchanged throughout). …