So, over the past few days I've experienced this crash multiple times in the process of developing my modpack. Upon opening the world creation menu, the game crashes. The description is always the same: mouseClicked event handler. It also seems to have something to do with VillagerTrades. I've included several crash reports from multiple iterations of my pack. Some of them list moonlight as a suspected mod, others don't.

https://mclo.gs/sLaUkjC
https://mclo.gs/M5A4EEp
https://mclo.gs/TAHU37c

Downgrade Forge to 47.3.25. This should be fixed by #191.