[1.21] NullpointerException on Save and Quit to Title

[miguelccoelho]

Describe the bug
When pressing Save and Quit to Title, I get a crash. When I check the log, it seems to be a NullpointerException when ticking an entity. It seems the world is still saved.

Crash details can be found here:
https://pastebin.com/eUTFW5qW

Expected behavior
To exit successfully, without crashes.

To Reproduce
I have water and ice nearby in this scenario. I am in game for 10s to a minute, and then I decide to Save and Quit To Title. When I do, sometimes I get a crash.

Screenshots
N/A

Hardware and OS
Can be found in the exception log above.

Versions

• Minecraft version: 1.21
• Mod loader and version (e.g fabric or quilt) : Fabric 0.16.2
• Wakes version: 0.3.0
• Fabric API (or quilt equivalent) version: Fabric API 0.103.0

Additional information
N/A

[Partonetrain]

Having the same issue on 1.20.1, Fabric 0.15.11