To Reproduce
Steps to reproduce the crash:

1. Install Flans mod, Galacticraft and Extra Planets(version 1.12.2)
2. Launch Minecraft
3. It will crash!

Screenshots

Versions (please complete the following information)

• Forge: 14.23.5.2860
• Flan's Mod: 5.5.2

Crash Log

https://pastebin.com/Xfqumru5

Additional context