AssetMover fails to download the resources when the Custom Loading Screen mod is installed.

Debug log: https://mclo.gs/z8apUji#L17144

AssetMover: 2.5
Subaquatic: v1.1.0-mc1.12.2
Custom Loading Screen: 1.5.7
Java: 1.8.0_371

I'm getting this exact error with the ExtraSoundsLegacy mod as well: https://mclo.gs/RxMMHD5
Though on Java 1.8.0_51.

Seems like the code needs a null-check in there, it's a very weird bug.