Player on my server has this error posting to my server console. No one at their base. I went through the nether and come out at the place and it posts this error in the console... at these coordinates is a Controller. I have a controller at my place and have one block of drawers joined to it and I do not get any error when I go there. My controller doesn't touch any drawers. Theirs does. So thought that could be a problem. Moved it, found they also have three separate groupings of drawers to the controller. Went through the portal and come back and now the same error but the location is where i moved the controller to.

Any thoughts as to what is happening? Log attached.

https://mclo.gs/X5DdTSU