When updated from Fluidlogged API 1.4 to 1.42

• Can confirm that without Fluidlogged API, there is no error.
  

I can't recreate this issue, perhaps try removing some mods to see if it's the result of a confliction

Sorry for the late reply.
Yes, I will try to reduce my modlist.

Also, tried the 1.4 version again, and it's working without the bug. But, after joining the world, I got a crash.
Here is the crash report: https://paste.dimdev.org/fimemukizi.mccrash

• Also, this is my latest.log
  https://paste.ee/p/w7im7
  Using the 1.42 version.

Ok, found out exactly what mod is causing this. It is:

1. The Streams
2. And the Farseek

Hope that you will be able to fix it! :D

fixed in v1.4.3!