BuildCraft version: buildcraft-all-7.99.24.1
Forge version: 14.23.5.2838
Link to crash report or log: https://pastebin.com/pPQK6s2k
Singleplayer or multiplayer: singleplayer
Steps to reproduce: build use wires on kinetic pipes
Additional information:

This has happened a couple of times now and is solved by restoring a backup of the world. I then rebuild the kinetic pipes (stone and quartz) and add wires on to the kinetic pipes. Then save/exit the world. When I try to reload the world this crash occurs.

Just ask if you would like me to try something else.

A bit more info. It happened again when loading my main world (which was the restored world). I then was able to creat a new world, returned to title screen and deleted the new world. I was then able to successfully load my main world (with the wires). Removed 50% of the wires in the world and was able to save and reload into the main world again. Issues seems to have resolved.

I have the backed up world. Can provide if it helps.