Sophisticated Core (Unofficial Fabric port) causing an instant crash of the game.

[Nekomatata54]

Hello, I made my own modpack to play with a friend and as we played, the game suddenly crashed. After taking a look at the logs all I saw was some lines with "sophisticatedbackpacks" and "sophisticated core" written.

The crash only occurs once my player joins his, either instantly or after 5-6 minutes. We use the mod Essential to connect to each other.

Here is the log:

https://pastebin.com/LAr4pn0y

Thanks in advance for any help you could provide.

Edit: It was due to an incompatibility, where an enchantment making the world harder, spawning mobs with full armor troubling the backpack mob generation.