After trying several installations here is one allowing my party to talk to Berrun Ghastkill and keep playing so far.
Base game: GoG latest versions
- setup_baldurs_gate_2.0.0.20
- setup_baldurs_gate2_2.0.0.12
BWS up-to date
Mode: Baldur's Gate 2 / Baldur's Gate Trilogy (BGT) Customization
Preset: BWS "Recommended" selection (high quality, well-integrated content)
Unchecked from the preset
BG1 NPC Project
- 008: The BG1 NPC Project: Add Non-Joignable NPC portraits to quests and dialogues
BG1 Unfinished Business
- 0019: Minor Dialoque Restorations
- 0020: Minor Audio Restorations
Gerri's BGT NPC Portraits
- 0000: Portraits for BG1 (BGT or EET)
I'm not sure which one exactly was generating the crash, I've added a save of game the just before talking to Berrun if someone wants to try and figure the issue.
I hope it can help!