Hey we're using this mod in our modpack and it caused the server to crash https://pastebin.com/ETBcjq5r when someone was right-clicking a lens using the AS binding tool. The weirdest part was after the server was restarted all the block ids of placed items were scrambled as well. For example - a cooking for blockheads book was instead a forestry squeezer. Upon resetting the server to an older save we were okay and we tested for repeatability and it didn't happen again so we're not sure if it was a one time thing or what. (I have a copy of the broken world saved let me know if you want to see that.)

Uh, so this crash is basically the result of something else going wrong - namely a lens that's missing its crystal properties completely... I'm uncertain how this could happen besides someone obtained a lens/prism without any properties through some invalid means... so.. yea. idk what say to this.
Any reliable way to reproduce this? Any way to obtain said lenses without properties?

Well, information never provided. At least more safety handling is in place for this now.