This is probably a cross mod issue requiring some collaboration between the two mods involved for the best solution. I already reported the bug to the JustenoughResources developer and he asked me to also post the issue in this tracker. Original issue can be found at way2muchnoise/JustEnoughResources#167

Versions

Betweenlands version:

3.3.13

JER version:

0.8.5.27

Forge version:

1.12.2-14.23.5.2768

Singleplayer or Multiplayer:

Both in Single Player and Multiplayer. Tested with vanilla server + forge only, not sponge.

Installed mods:

This bug can be reproduce with only JEI, JER and The Betweenlands installed without any other mod.

Link to full crash log

crash-2018-10-29_19.14.28-server.txt

Description of the problem

How to reproduce:

1. Install JEI, JER and TBL mods
2. Start a new test world
3. run the JER command: /profile 10

Expected result:

Game should not crash and JER should be able to profile the The Betweenland dimension

Actual result:

Game crashes

Already fixed on JERs side, read my comment there.