Tab list sorting - Null pointer Exception on client?

[Bit]

Script Version (do not put latest): 2.6.2
Script Author: SkriptLang
Minecraft Version: git-Paper-1620 (MC: 1.12.2)
Full Code:

on load:
    delete {ranks::*}
    delete {prefixes::*}
    set {ranks::staff} to "A-staff"
    set {ranks::donator} to "B-donator"
    set {ranks::player} to "C-player"

on join:
    updateTab(player)
 
function updateTab(p: player):
    loop {ranks::*}:
        {_p}.getScoreboard().registerNewTeam(loop-value)
        player.getScoreboard().getTeam(loop-value).setPrefix({prefixes::%loop-index%})
    if {_p} has permission "group.staff":
        set {rank::sorting::%{_p}%} to "A-staff"
     
    else if {_p} has permission "group.donator":
        set {rank::sorting::%{_p}%} to "B-donator"
     
    else:
        set {rank::sorting::%{_p}%} to "C-player"
     
    {_p}.getScoreboard().getTeam({rank::sorting::%{_p}%}).addPlayer(player)
    loop players:
        loop-player.getScoreboard().getTeam({rank::sorting::%{_p}%}).addPlayer({_p})
        {_p}.getScoreboard().getTeam({rank::sorting::%loop-player%}).addPlayer(loop-player)

Errors on Reload:
There are no errors printed on reload or in general in to the console, yet clients get the following error as soon as more than one player is online:

Error executing task
java.util.concurrent.ExecutionException: java.lang.IllegalStateException: Player is either on another team or not on any team. Cannot remove from team 'A-staff'.
	at java.util.concurrent.FutureTask.report(FutureTask.java:122)
	at java.util.concurrent.FutureTask.get(FutureTask.java:192)
	at g.a(Util.java:20)
	at ave.av(SourceFile:881)
	at ave.a(SourceFile:325)
	at net.minecraft.client.main.Main.main(SourceFile:124)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:497)
	at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
	at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
Caused by: java.lang.IllegalStateException: Player is either on another team or not on any team. Cannot remove from team 'A-staff'.
	at auo.a(SourceFile:271)
	at bcy.a(SourceFile:1387)
	at hr.a(SourceFile:113)
	at hr.a(SourceFile:13)
	at fh$1.run(PacketThreadUtil.java:22)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at g.a(Util.java:19)
	... 9 more

After that the client's console is getting spammed with Null Pointer Exceptions.

Other Useful Info:
I tried to use the solution by Shane found at https://forums.skunity.com/threads/tab-sorting.8944/
Yet, I use script-reflect instead of script-mirror
Addons using (including versions):
- skDragon v0.17
- skript-reflect v2.3 (https://github.com/TPGamesNL/skript-reflect)
- skript-db v1.3.6
- SkQuery v4.1.4
- Skore v1.0.3
- MundoSK v1.8.6-BETA.57 (https://forums.skunity.com/resources/mundosk.69/)
- SkStuff v1.6.4.1-fork-1.12
[doublepost=1658488193,1657804529][/doublepost]Bump