Server Version:
PaperSpigot 1.21-632288e13
Marriage Master 2.7.6:

Online Mode: Yes

Bungecord: Yes

Details

Error occurs when players use /marry gift. Error is as follows: https://gist.github.com/Tomographix/d21a605a01a9412679d8c230ab07dafe

No surprises here - normal application of /marry gift

Wanted to addonto this issue -
Also experiencing the same errors on console
Just wanted to add reg blocks are fine but cant send an enchanted item (vanilla book, enchanted tool etc or custom items)