A player of mine can no longer connect to the server. When he joins, the server console sends a ticking player error based on a packet and then disconnects the player from the server. Here is what the console shows:

https://pastebin.com/BRHv0cYZ

I checked the player data to see if he has any unstable block in his inventory and he does not. I'm not sure how to resolve the issue so the player can connect.

Version: Mubble-1.3-pre6-(1.12.2)
Forge: 2811

Thanks for the report!

This bug has been fixed in v1.3.