Buildcraft version: 7.99.8.1
Forge version: 13.20.1.2563
Link to crashreport or log (on pastebin or gist, please don't put the entire log here) :
Singleplayer/multiplayer: Sigleplayer

Additional information: robots is missing at 7.99.8.1 (1.11.2), can you fix this?

Thanks for the report, this is actually a duplicate of #3755

thanks