I had a unknown crash, whilst I was travelling through the world. I post it to all mods that seems to be in the crash, maybe someone could find the bug. I had this crash several times. Same as Aang23/UndergroundBiomesConstructs#3 and sp614x/optifine#1837

See crash log for detailed mod information.

Could be related to sp614x/optifine#1488 or iChun/IssueTracker-Mods#61

crash-2018-09-27_01.21.51-client.txt
crash-2018-09-27_01.20.49-server.txt

This is an issue with either UndergroundBiomes or NuclearCraft. I see you've already opened Aang23/UndergroundBiomesConstructs#3; can you open a bug against NuclearCraft as well? EDIT: Now fixed by tomdodd4598/NuclearCraft#366.

Also, only the server crash report is important.

I confirmed this isn't actually related to Oreberries; see Aang23/UndergroundBiomesConstructs#3 and tomdodd4598/NuclearCraft#366.