My girlfriend is experiencing an issue on a server being hosted via Aternos. I personally am not experiencing this issue as it works just fine for me. When she places the modded blocks, specifically the "FreezerBlock" according to the error log (although it happened with every block she attempted to place from the mod) her game crashes although it does not crash when utilizing normal, vanilla blocks.

Crash log:
https://mclo.gs/liABjRk

Update, it happens to me as well with the exact same error but ONLY with the fridge.

Fixed in 818a932