Mapped select shows no options

Hello,

after last update of your plugin form select with custom taxonomy terms return no options :(. If you check the screens below you will see the select is empty. There used to be all taxonomy terms. Even if I tried create a new form with new mapping the select still shows no options (custom taxonomy terms).

1: https://nove.luhacovice.cz/wp-content/uploads/2020/09/Sni?mek-obrazovky-2020-09-30-v-13.30.24.png
2: https://nove.luhacovice.cz/wp-content/uploads/2020/09/Sni?mek-obrazovky-2020-09-30-v-13.29.46.png
3: https://nove.luhacovice.cz/wp-content/uploads/2020/09/Sni?mek-obrazovky-2020-09-30-v-13.32.24.png

Thanks for the help, Marek.

The page I need help with: [log in to see the link]