How to fix a ticking player on a Minecraft server
Not all player-related crashes are clear or present. We will cover a brief identification of the cause, which is not always clear.
Now, for this crash, it seems it may be caused by an armour that the player has equipped.
How to deal with this issue?
Wipe the player
The simplest method is that the player will lose anything they have on them, in their inventory, and in the effects location.
Editing player data.
A little more complex. This involves editing the player's data. We can do this with NBT Explorer & their UUID
You will need. If you don't have extensive experience, are unsure of the cause, or are unsure overall, you can contact support or simply wipe the player.
For UUID, you can put the player's name into name mc, and it will return the UUID.
Steps.
Copy the user's name from the crash report and go to https://namemc.com/
Paste in the player's name.
Copy the UUID.
Log in to the panel.
Go to the file manager.
Open the world folder.
Open player data.
Paste the UUID into the search bar.
Download the .dat file for that player.
Copy & paste this file on your pc In case something goes wrong, this is an unedited version.
Open NBT Explorer.
Drag the .dat file into NBT Explorer.
Here you will see the data for that user. This will vary on the MC version.
We are looking for inventory. Once found, expand by clicking +
Once opened, you can see the contents. We will be looking for armour.
Once you have located armour, likely named 'helm', 'chest plate', etc., click on that entry and hit delete.
Then save the file.
Delete the version of that .dat on the server.
Upload the edited one.