Reported from CurseForge, adding here for consistency. Doesn't actually crash, causes a client/server disconnect.

latest.log
Source

I believe this is caused by #c3c65348ee304a6272a04f47966d0d0e9c298691. I will have a look at fixing it over the next few days, hopefully.
On a meta note, do you want to move bugs/crashes to the issue system in Github, and leave the trello board for features only?

I believe this is caused by #c3c65348ee304a6272a04f47966d0d0e9c298691. I will have a look at fixing it over the next few days, hopefully.
On a meta note, do you want to move bugs/crashes to the issue system in Github, and leave the trello board for features only?

I personally prefer the GitHub system, it's easy to organize and specialized for this use case, but Trello's fine too. Whichever's easier for you.

Forge Exception When Using Grenade Launcher's from many pack's after updating version to 1.45 - client disconnect

Should be fixed in the next update.