Can`t use conditional fields with Taxonomy Term Reference Tree Widget module

Issue Summary

I have a select list with some values. When one of them have been chosen i would like to see another mandatory field (term reference) with widget by this module.
But with entered values in term reference tree drupal displays an error which says that no values have been entered in the term reference field. If i try to use another widget it works just fine..

Thanks for your support in advance!