Console starts spamming when a player milk a cow no matter if he is in survival or creative mode

To Reproduce
Steps to reproduce the behavior:

1. Milk a cow

Error: https://pastebin.com/T0s9Ernq

Software Details:

• Server Software: Paperspigot
• Server Software Version: paper-1.16.5-794
• Plugin Version: PicoJobs-1.0-beta-6a
• Java Version: openjdk 16.0.1 2021-04-20

Additional context
Add any other context about the problem here.

This issue should be fixed in the latest development builds.