If Membership 2 is active FacetWP won't work

I'm having a problem with the membership plugin, it's causing another plugin FacetWP to not work.
FacetWP basically lets you add some checkboxes to search pages to filter down your search results https://facetwp.com
It appears to use ajax to retrieve information on which checkboxes it should show and which are selected
It's this ajax request that I think is breaking.
It works with Membership disable and stops working as soon as turn membership on again.

Link to WPFacet zip file included in chat.