segmentation fault when calling generate function in python runtime

[Saibo-creator]

Hello @inariksit
Thanks for the great tutorials for using GF in other languages! They are very helpful!
I'm particuarly interested in the generation function of the grammar, i.e. use incremental parser to suggest grammtically correct next words, as shown in the demo "minibar":https://cloud.grammaticalframework.org/minibar/minibar.html

But when I try to call the generate function in python runtime , I get the following error:

Reproduction:

import pgf
gr = pgf.readPGF("MiniLang.pgf")
eng = gr.languages["MiniLangEng"]
eng.complete("the star is big")

Error:
23484 segmentation fault python ReflTransfer.py

Since the python runtime is binded from the c runtime, I guess this issue is caused by a bug in the c runtime.
Do you think I should raise this issue in the GF_core project repository ?
Thank you!