If you place a Fluid Autofiller then open its GUI and click it's center slot, it causes a crash with the following crash report.
Minecraft 1.12.2
Mekanism is not installed.
https://gist.github.com/TeraV8/7f1f5754ad919af919a71b90b13f59c6

If you place a Fluid Autofiller then open its GUI and click it's center slot, it causes a crash with the following crash report. Minecraft 1.12.2 Mekanism is not installed. https://gist.github.com/TeraV8/7f1f5754ad919af919a71b90b13f59c6

This bug was fixed in version 1.3.1(#40). Please update to that version.

This looks to have regressed in 1.3.8:
Minecraft 1.12.2
Enigmatica 2: Expert - Extended

Liquid: Liquid Concrete
Recipe: Polymer Clay

Log: https://gist.github.com/Zyian/9477b3c36e3e27755a069dc3600866d0