Conflict with Ninja forms

Hi,

I’m currently facing an issue where activating the pronamic plugin causes Ninja forms to not display created forms in the backend.
This is a bit of an issue because I am looking for a way to replace Gravity forms with Ninja forms.

I have tested this on two separate websites on two different servers, both have the same issue.
This is happening with Ninja forms versions 3.4.6 and higher. Ninja version 3.4.5 displays the forms fine.
The Pronamic plugin version is 5.6.0, WP version 5.1.1 on both tested installs.

Is ninja forms supported? I don’t see it in the list of supported plugins in the information of the pronamic plugin, but there is information on integrating the plugin with Ninja forms on the Pronamic website.