Thank you for reporting!

For issues:

• Try the latest version, it may have fixed the issue already.
• If you crashed, please paste the crash log to gist and link it here.
  Here is the log: https://gist.github.com/TianmuLong/df8542d6627e76c8366cd85d82ac7af8

(And it also crashed in some modpack with KubeJS)
(I'm not sure if it is Forestry's problem or something else)
https://gist.github.com/TianmuLong/7b87e823dbedc3cf4a94d0c3a4bf6b61