It seems to be a problem only with the exported ini files (not with the autogenerated-on-close ones")
Reproduced with taurus 3.7.1 and 4.0
To reproduce:
rm .config/Taurus/EXAMPLE\ 01.ini
taurusgui example01
taurusgui example01
taurusconfigbrowser foo.ini
(You get a segfault)