Leaving causes a massive lag spike and timeout for others

[epicpeet10]

Describe the bug
A clear and concise description of what the bug is.
leaving the server causes a huge lag spike for players and potentionally a timeout alive
To Reproduce
Steps to reproduce the behavior:

1. Go to 'leave the server'

Expected behavior
A clear and concise description of what you expected to happen.
00:41:19] [Server thread/ERROR]: Could not pass event PlayerQuitEvent to eco v6.75.2
org.bukkit.event.EventException: null
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:310) ~[spigot-api-1.20.4-R0.1-SNAPSHOT.jar:?]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70) ~[spigot-api-1.20.4-R0.1-SNAPSHOT.jar:?]
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:600) ~[spigot-api-1.20.4-R0.1-SNAPSHOT.jar:?]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:587) ~[spigot-api-1.20.4-R0.1-SNAPSHOT.jar:?]
at net.minecraft.server.players.PlayerList.remove(PlayerList.java:516) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4090-Spigot-b754dcc-38b1f49]
at net.minecraft.server.network.PlayerConnection.q(PlayerConnection.java:1724) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4090-Spigot-b754dcc-38b1f49]
at net.minecraft.server.network.PlayerConnection.a(PlayerConnection.java:1711) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4090-Spigot-b754dcc-38b1f49]
at net.minecraft.network.NetworkManager.p(NetworkManager.java:611) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4090-Spigot-b754dcc-38b1f49]
at net.minecraft.server.network.ServerConnection.c(ServerConnection.java:200) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4090-Spigot-b754dcc-38b1f49]
at net.minecraft.server.MinecraftServer.b(MinecraftServer.java:1399) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4090-Spigot-b754dcc-38b1f49]
at net.minecraft.server.dedicated.DedicatedServer.b(DedicatedServer.java:391) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4090-Spigot-b754dcc-38b1f49]
at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:1242) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4090-Spigot-b754dcc-38b1f49]
at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:1054) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4090-Spigot-b754dcc-38b1f49]
at net.minecraft.server.MinecraftServer.lambda$0(MinecraftServer.java:304) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4090-Spigot-b754dcc-38b1f49]
at java.lang.Thread.run(Thread.java:1583) ~[?:?]
Caused by: java.lang.IllegalAccessError: class com.willfp.eco.internal.spigot.proxy.v1_20_R3.common.packet.PacketInjectorListener tried to access protected field net.minecraft.server.network.ServerCommonPacketListenerImpl.c (com.willfp.eco.internal.spigot.proxy.v1_20_R3.common.packet.PacketInjectorListener is in unnamed module of loader org.bukkit.plugin.java.PluginClassLoader @457eed40; net.minecraft.server.network.ServerCommonPacketListenerImpl is in unnamed module of loader java.net.URLClassLoader @69d0a921)
at com.willfp.eco.internal.spigot.proxy.v1_20_R3.common.packet.PacketInjectorListener.onLeave(PacketInjectorListener.kt:34) ~[?:?]
at jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103) ~[?:?]
at java.lang.reflect.Method.invoke(Method.java:580) ~[?:?]
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[spigot-api-1.20.4-R0.1-SNAPSHOT.jar:?]
... 14 more
[00:41:19] [Craft Scheduler Thread - 13/WARN]: Unexpected token END OF FILE at position 0.
[00:41:19] [Craft Scheduler Thread - 13/WARN]: at org.json.simple.parser.JSONParser.parse(JSONParser.java:257)
[00:41:19] [Craft Scheduler Thread - 13/WARN]: at org.json.simple.parser.JSONParser.parse(JSONParser.java:92)
[00:41:19] [Craft Scheduler Thread - 13/WARN]: at me.f64.playtime.Main.writePlayer(Main.java:164)
[00:41:19] [Craft Scheduler Thread - 13/WARN]: at me.f64.playtime.Main.lambda$savePlayer$3(Main.java:150)
[00:41:19] [Craft Scheduler Thread - 13/WARN]: at org.bukkit.craftbukkit.v1_20_R3.scheduler.CraftTask.run(CraftTask.java:82)
[00:41:19] [Craft Scheduler Thread - 13/WARN]: at org.bukkit.craftbukkit.v1_20_R3.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:54)
[00:41:19] [Craft Scheduler Thread - 13/WARN]: at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
[00:41:19] [Craft Scheduler Thread - 13/WARN]: at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
[00:41:19] [Craft Scheduler Thread - 13/WARN]: at java.base/java.lang.Thread.run(Thread.java:1583)

Server Information (please complete the following information):

• Version: (output of /ver command)
• Version of plugin and eco (/ver eco, /ver <plugin>)
  latest eco and plugins