Note: Energy Converters 1.2.0.10 must be installed.

BuildCraft version: 7.99.21
Forge version: 14.23.5.2768
Link to crash report or log: Link to PasteBin
Singleplayer or multiplayer: Single player
Steps to reproduce:

1. Create a new creative single player world
2. Place down a chest, and attach a wooden transport pipe
3. Place an MJ Energy producer adjacent to the transport pipe
4. The game should crash, and subsequent attempts to launch the world will crash the game.

this is an bug with energy converts, it is sending energy to the wooden pipe on the client side, and causing client side item extraction. This is a very bad idea and should never be done, all item/energy logic should only run on the server, not the client.