KMouth crashes when I am trying to use flite engine with any voice

every time when I open `kmouth` which is configured to use `flite` engine after I click the `speak` button it crashes. The information indicate that the crash is happened with the function `feat_set` in the library `/lib64/libflite.so.1`.

flite version: `flite-2.2-current Sep 2018`
kmouth version: `kmouth 25.08.1`
error name: `SIGSEGV 11`