Here you see a clip what happened in stream with name filter:
https://clips.twitch.tv/LivelyColorfulMilkDatBoi

Here you can find the crash log:
https://pastebin.com/MJAbES3r

Modpack: Sigma 5.0.3
Mod version: RefinedRelocation_1.14.4-6.2.6
Forge version: 28.1.99

Fix for 1.15+ pending release on CurseForge, backport to 1.14 planned: #104