Skript/Server Version

> skript info
[18:25:40 INFO]: [Skript] Skript's aliases can be found here: https://github.com/SkriptLang/skript-aliases
[18:25:40 INFO]: [Skript] Skript's documentation can be found here: https://docs.skriptlang.org/
[18:25:40 INFO]: [Skript] Skript's tutorials can be found here: https://docs.skriptlang.org/tutorials
[18:25:40 INFO]: [Skript] Server Version: 1.20.6-101-f0bd0cc (MC: 1.20.6)
[18:25:40 INFO]: [Skript] Skript Version: 2.9.0-beta1 (skriptlang-github)
[18:25:40 INFO]: [Skript] Installed Skript Addons: None
[18:25:40 INFO]: [Skript] Installed dependencies: 
[18:25:40 INFO]: [Skript]  - Vault v1.7.3-b131
[18:25:40 INFO]: [Skript]  - WorldGuard v7.0.11-SNAPSHOT+2274-ead1e1b

### Bug Description

NPE on server start-up. This was exposed by a change in Paper since 1.20.6-98.


### Expected Behavior

Clean start-up

### Steps to Reproduce

- Update Paper to 1.20.6-99 or later
- Start server
- Read console/log

### Errors or Screenshots

[18:07:51] [Server thread/INFO]: [Skript] Enabling Skript v2.9.0-beta1
[18:07:51] [Server thread/INFO]: [Skript] The updater is disabled, so a check for the latest version of Skript was not performed.
[18:07:55] [Server thread/ERROR]: Error occurred while enabling Skript v2.9.0-beta1 (Is it up to date?)
java.lang.NullPointerException: Cannot invoke "java.lang.Integer.equals(Object)" because "this.color" is null
at org.bukkit.craftbukkit.inventory.CraftMetaColorableArmor.equalsCommon(CraftMetaColorableArmor.java:118) ~[paper-1.20.6.jar:1.20.6-101-f0bd0cc]
at org.bukkit.craftbukkit.inventory.CraftItemFactory.equals(CraftItemFactory.java:415) ~[paper-1.20.6.jar:1.20.6-101-f0bd0cc]
at org.bukkit.craftbukkit.inventory.CraftItemFactory.equals(CraftItemFactory.java:402) ~[paper-1.20.6.jar:1.20.6-101-f0bd0cc]
at org.bukkit.craftbukkit.inventory.CraftMetaItem.equals(CraftMetaItem.java:1544) ~[paper-1.20.6.jar:1.20.6-101-f0bd0cc]
at Skript-2.9.0-beta1.jar/ch.njol.skript.aliases.ItemData.compareItemMetas(ItemData.java:447) ~[Skript-2.9.0-beta1.jar:?]
at Skript-2.9.0-beta1.jar/ch.njol.skript.aliases.ItemData.matchAlias(ItemData.java:355) ~[Skript-2.9.0-beta1.jar:?]
at Skript-2.9.0-beta1.jar/ch.njol.skript.aliases.AliasesMap.exactMatch(AliasesMap.java:215) ~[Skript-2.9.0-beta1.jar:?]
at Skript-2.9.0-beta1.jar/ch.njol.skript.aliases.AliasesProvider.addAlias(AliasesProvider.java:322) ~[Skript-2.9.0-beta1.jar:?]
at Skript-2.9.0-beta1.jar/ch.njol.skript.aliases.AliasesParser.loadSingleAlias(AliasesParser.java:705) ~[Skript-2.9.0-beta1.jar:?]
at Skript-2.9.0-beta1.jar/ch.njol.skript.aliases.AliasesParser.loadAlias(AliasesParser.java:614) ~[Skript-2.9.0-beta1.jar:?]
at Skript-2.9.0-beta1.jar/ch.njol.skript.aliases.AliasesParser.load(AliasesParser.java:121) ~[Skript-2.9.0-beta1.jar:?]
at Skript-2.9.0-beta1.jar/ch.njol.skript.aliases.Aliases.load(Aliases.java:506) ~[Skript-2.9.0-beta1.jar:?]
at Skript-2.9.0-beta1.jar/ch.njol.skript.aliases.Aliases.load(Aliases.java:492) ~[Skript-2.9.0-beta1.jar:?]
at Skript-2.9.0-beta1.jar/ch.njol.skript.aliases.Aliases.lambda$loadDirectory$1(Aliases.java:475) ~[Skript-2.9.0-beta1.jar:?]
at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184) ~[?:?]
at java.base/java.util.ArrayList.forEach(ArrayList.java:1597) ~[?:?]
at java.base/java.util.stream.SortedOps$RefSortingSink.end(SortedOps.java:395) ~[?:?]
at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:557) ~[?:?]
at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:546) ~[?:?]
at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151) ~[?:?]
at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174) ~[?:?]
at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:265) ~[?:?]
at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:611) ~[?:?]
at Skript-2.9.0-beta1.jar/ch.njol.skript.aliases.Aliases.loadDirectory(Aliases.java:468) ~[Skript-2.9.0-beta1.jar:?]
at Skript-2.9.0-beta1.jar/ch.njol.skript.aliases.Aliases.loadInternal(Aliases.java:433) ~[Skript-2.9.0-beta1.jar:?]
at Skript-2.9.0-beta1.jar/ch.njol.skript.aliases.Aliases.load(Aliases.java:389) ~[Skript-2.9.0-beta1.jar:?]
at Skript-2.9.0-beta1.jar/ch.njol.skript.Skript.onEnable(Skript.java:508) ~[Skript-2.9.0-beta1.jar:?]
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:287) ~[paper-api-1.20.6-R0.1-SNAPSHOT.jar:?]
at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.enablePlugin(PaperPluginInstanceManager.java:202) ~[paper-1.20.6.jar:1.20.6-101-f0bd0cc]
at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.enablePlugin(PaperPluginManagerImpl.java:109) ~[paper-1.20.6.jar:1.20.6-101-f0bd0cc]
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:519) ~[paper-api-1.20.6-R0.1-SNAPSHOT.jar:?]
at org.bukkit.craftbukkit.CraftServer.enablePlugin(CraftServer.java:604) ~[paper-1.20.6.jar:1.20.6-101-f0bd0cc]
at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:553) ~[paper-1.20.6.jar:1.20.6-101-f0bd0cc]
at net.minecraft.server.MinecraftServer.loadWorld0(MinecraftServer.java:675) ~[paper-1.20.6.jar:1.20.6-101-f0bd0cc]
at net.minecraft.server.MinecraftServer.loadLevel(MinecraftServer.java:437) ~[paper-1.20.6.jar:1.20.6-101-f0bd0cc]
at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:323) ~[paper-1.20.6.jar:1.20.6-101-f0bd0cc]
at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1136) ~[paper-1.20.6.jar:1.20.6-101-f0bd0cc]
at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:323) ~[paper-1.20.6.jar:1.20.6-101-f0bd0cc]
at java.base/java.lang.Thread.run(Thread.java:1570) ~[?:?]
[18:07:55] [Server thread/INFO]: [Skript] Disabling Skript v2.9.0-beta1
[18:07:55] [Server thread/ERROR]: Error occurred while disabling Skript v2.9.0-beta1
java.lang.ExceptionInInitializerError: null
at Skript-2.9.0-beta1.jar/ch.njol.skript.Skript.beforeDisable(Skript.java:1192) ~[Skript-2.9.0-beta1.jar:?]
at Skript-2.9.0-beta1.jar/ch.njol.skript.Skript.onDisable(Skript.java:1204) ~[Skript-2.9.0-beta1.jar:?]
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:290) ~[paper-api-1.20.6-R0.1-SNAPSHOT.jar:?]
at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.disablePlugin(PaperPluginInstanceManager.java:237) ~[paper-1.20.6.jar:1.20.6-101-f0bd0cc]
at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.disablePlugin(PaperPluginManagerImpl.java:114) ~[paper-1.20.6.jar:1.20.6-101-f0bd0cc]
at org.bukkit.plugin.SimplePluginManager.disablePlugin(SimplePluginManager.java:549) ~[paper-api-1.20.6-R0.1-SNAPSHOT.jar:?]
at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.enablePlugin(PaperPluginInstanceManager.java:206) ~[paper-1.20.6.jar:1.20.6-101-f0bd0cc]
at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.enablePlugin(PaperPluginManagerImpl.java:109) ~[paper-1.20.6.jar:1.20.6-101-f0bd0cc]
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:519) ~[paper-api-1.20.6-R0.1-SNAPSHOT.jar:?]
at org.bukkit.craftbukkit.CraftServer.enablePlugin(CraftServer.java:604) ~[paper-1.20.6.jar:1.20.6-101-f0bd0cc]
at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:553) ~[paper-1.20.6.jar:1.20.6-101-f0bd0cc]
at net.minecraft.server.MinecraftServer.loadWorld0(MinecraftServer.java:675) ~[paper-1.20.6.jar:1.20.6-101-f0bd0cc]
at net.minecraft.server.MinecraftServer.loadLevel(MinecraftServer.java:437) ~[paper-1.20.6.jar:1.20.6-101-f0bd0cc]
at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:323) ~[paper-1.20.6.jar:1.20.6-101-f0bd0cc]
at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1136) ~[paper-1.20.6.jar:1.20.6-101-f0bd0cc]
at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:323) ~[paper-1.20.6.jar:1.20.6-101-f0bd0cc]
at java.base/java.lang.Thread.run(Thread.java:1570) ~[?:?]
Caused by: ch.njol.skript.SkriptAPIException: Registration can only be done during plugin initialization
at Skript-2.9.0-beta1.jar/ch.njol.skript.Skript.checkAcceptRegistrations(Skript.java:1299) ~[Skript-2.9.0-beta1.jar:?]
at Skript-2.9.0-beta1.jar/ch.njol.skript.Skript.registerEvent(Skript.java:1501) ~[Skript-2.9.0-beta1.jar:?]
at Skript-2.9.0-beta1.jar/ch.njol.skript.events.EvtSkript.(EvtSkript.java:39) ~[Skript-2.9.0-beta1.jar:?]
... 17 more

### Other

_No response_

### Agreement

- [X] I have read the guidelines above and affirm I am following them with this report.

this is a paper bug:
PaperMC/Paper#10789

you're welcome... just wanted to let you know they fixed it, just waiting for the update to show up on the paper download page

Thanks. Probably not the only thing they broke.

Confirmed fixed with Paper 1.20.6-102.