Describe the bug
When I open the AE2 advancements tab in game, my client crashes, with a NPE.

To Reproduce

1. Connect to a world (single or multi-player)
2. Go to escape menu
3. Advancements menu
4. Click on AE2 tab

Expected behavior
The advancements tab should be displayed.

Additional context
Crash log : https://pastebin.com/4Zc6rU7y

Environment

• Modpack FTB Sky Adventures, version 1.3.0
• Minecraft 1.12.2
• Forge 14.23.5.2770
• AE2 rv6 stable 4
• 6 GB RAM
• First produced on MP
• No modification of the modpack (same mods, same versions as provided by the pack version)

Duplicate of #3810