Crash report
Log
Looks like it's happening when loading a particular chunk in/near my base.

Very sorry about the original log issue and late reply, I hadn't played since and wasn't checking github. Looks like I've narrowed it down to Iris causing the crash:

Crash Report
Log

Whether with the rest of my mods or without, adding Iris causes it to happen.

This looks like a mod incompatibility. Can you try with different combinations of mods and let me know which mod(s) multiconnect is incompatible with?

Hi, please don't upload logs to expiring pastebins, can you reupload it please?

This is unlikely to occur after the rewrite. Please reply if it does.