Error occurred while stop the server

[HuJK]

What happened?

Error occurred while disabling FastLogin

[18:03:15 ERROR]: Error occurred while disabling FastLogin v1.12-SNAPSHOT-4dd6b9a
java.util.ConcurrentModificationException: null
        at java.util.HashMap$HashIterator.nextNode(HashMap.java:1605) ~[?:?]
        at java.util.HashMap$ValueIterator.next(HashMap.java:1633) ~[?:?]
        at com.google.common.collect.TransformedIterator.next(TransformedIterator.java:52) ~[guava-32.1.2-jre.jar:?]
        at com.google.common.collect.Iterators$ConcatenatedIterator.hasNext(Iterators.java:1400) ~[guava-32.1.2-jre.jar:?]
        at com.comphenix.protocol.async.AsyncFilterManager.unregisterAsyncHandlers(AsyncFilterManager.java:289) ~[ProtocolLib-b726.jar:?]
        at com.comphenix.protocol.async.AsyncFilterManager.unregisterAsyncHandlers(AsyncFilterManager.java:283) ~[ProtocolLib-b726.jar:?]
        at com.github.games647.fastlogin.bukkit.FastLoginBukkit.onDisable(FastLoginBukkit.java:198) ~[FastLoginBukkit.jar:?]
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:290) ~[paper-api-1.20.4-R0.1-SNAPSHOT.jar:?]
        at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.disablePlugin(PaperPluginInstanceManager.java:223) ~[paper-1.20.4.jar:git-Paper-497]
        at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.disablePlugins(PaperPluginInstanceManager.java:147) ~[paper-1.20.4.jar:git-Paper-497]
        at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.disablePlugins(PaperPluginManagerImpl.java:92) ~[paper-1.20.4.jar:git-Paper-497]
        at org.bukkit.plugin.SimplePluginManager.disablePlugins(SimplePluginManager.java:528) ~[paper-api-1.20.4-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.craftbukkit.v1_20_R3.CraftServer.disablePlugins(CraftServer.java:570) ~[paper-1.20.4.jar:git-Paper-497]
        at net.minecraft.server.MinecraftServer.stopServer(MinecraftServer.java:974) ~[paper-1.20.4.jar:git-Paper-497]
        at net.minecraft.server.dedicated.DedicatedServer.stopServer(DedicatedServer.java:822) ~[paper-1.20.4.jar:git-Paper-497]
        at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1265) ~[paper-1.20.4.jar:git-Paper-497]
        at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:319) ~[paper-1.20.4.jar:git-Paper-497]
        at java.lang.Thread.run(Thread.java:1583) ~[?:?]

Steps to reproduce

stop the server

Plugin list

AuthME, FastLogin Geyser-Spigot Floodgate

Configuration file

No response

Server log

No response

Plugin version

v1.12-SNAPSHOT-4dd6b9a

Platform

Spigot

Relevance

• I tried the latest build
  (build refers to development builds not necessary a release version; i.e. v1.10 is out of date)

• I checked for existing tickets -
  If there are, please vote them with a thumbs reaction and not create new ones