Hello! Sorry it took a few days to get back to you on this. I took a look into this and immediately encountered the same crash, I'm not 100% certain on what exactly caused this to start happening now but I did fix it. I've uploaded version 1.6 which should fix this issue.
Apparently the plugin was trying to access Boundary System logic and there was no definition for Ritter.Boundary object, so simply creating the Ritter.Boundary object ( Ritter.Boundary = Ritter.Boundary || {}; ) appears to have fixed the issue.
Let me know how it goes, or if you run into any other issues.
Thank you and good luck with your game project!