Foreman_ansible giving stack trace after update to 2.3.2 on Ubuntu 16.04

Problem:
When clicking on a variable in the Configure->Ansible Variables, foreman gives a stack trace.

Expected outcome:
Click on a variable, brings up the variable edit screen.

Foreman and Proxy versions:
Foreman Version: 1.21.0
Foreman-proxy: 1.21.0
Foreman Ansible Smart Proxy: 2.1.2
Foreman Ansible Plugin: 2.3.2

It looks like this line is the problem. It’s passing a false for the parameter only_inline_select, which isn’t in the 1.21.0 foreman release. Removing that extra parameter fixes the problem.