Javascript error when changing entries

Hi

I have this Form

Anmeldung für
[select person-type “Adult” “Child”]

[group group-21]

<label> Name of Parent
[text* your-parent] </label>
[/group]

The condition is
Show group-21 when person-type = “Child”

The Field shows up correctly when i change to “child”, when i choose Adult again the js console logs an error

TypeError: $group.finish is not a function[Weitere Informationen] scripts.js:200:45
display_fields/<
https://website/wp/wp-content/plugins/cf7-conditional-fields/js/scripts.js:200:45
each
https://website/wp/wp-content/themes/CherryFramework/js/jquery-1.7.2.min.js:2:11774
each
https://website/wp/wp-content/themes/CherryFramework/js/jquery-1.7.2.min.js:2:8302
display_fields
https://website/wp/wp-content/plugins/cf7-conditional-fields/js/scripts.js:198:13