Mod Versions:
AquaAcrobatics-v1.3.1-1.12.2.jar
thiccentities-1.4.jar

Game won't launch with both mods installed, no given crash report.

Consider this conflict patched;

• https://github.com/Lylythii/Entifier
• https://www.curseforge.com/minecraft/mc-mods/entifier/files

Thanks, I've noted this on the mod page.

Just did a couple tests and it seems there isn't really a way to fix this. The issue seems to come from both mods patching EntityPlayer class.