Modpack version
0.4.14

Describe the bug
Server crashes upon joining. It's not consistent. I can usually join without a problem immediately after starting up the server, but it crashes if I leave and try to reconnect.

Logs
crash-2021-06-15_17.45.34-server.txt

This crash can happen when RS doesn't "like" some fluid tanks or their removal. If you are able to join disabling the fluid external storage and not using it in combination with that tank should get you going again.

This will be fixed in 1.9.13, which would already be out if not for some issues on Curseforge's side.
nvm it's out :D