https://minecraft.curseforge.com/projects/better-hud?comment=118

Getting randoms crashes with galacticraft core (and other mods) when fighting monsters.

Crash report:
crash-2019-01-19_02.54.48-client.txt
Config:
Ser.cfg.txt
Steps to reproduce/extra information: Happens ramdomly when I am fighting a monster, generally the one from mods, it crashes to title screen.

Please update to v1.4-beta.3, you're a version behind. This has been fixed.

Not fixed. Updated to beta3 still crash when fighting mobs

If you're reporting another crash then please provide another crash report. I don't believe the original crash you posted is possible in the current beta, but I may be wrong.