Just returned from end using rftools teleports, other play only placing modular power suits lights.

https://gist.github.com/Wrsaith/c9869365e83f51aaf7eab9c6eea45863

IE version 0.12-86
Forge 1.12.2 14.23.5.2768

seeing as how more as i read into the error more modular power suits place able lights was involved. and one of the players on the server was placing htem.