ERROR]: Could not pass event PlayerJoinEvent to StaffPlus v1.18.9

[gin-iro]

Checking the console today showed me several log entries like this. Can I do something to get the error to be gone?

[07:52:15 ERROR]: Could not pass event PlayerJoinEvent to StaffPlus v1.18.9 java.util.NoSuchElementException: packet_handler at io.netty.channel.DefaultChannelPipeline.getContextOrDie(DefaultChannelPipeline.java:1073) ~[netty-all-4.1.68.Final.jar:4.1.68.Final] at io.netty.channel.DefaultChannelPipeline.addBefore(DefaultChannelPipeline.java:248) ~[netty-all-4.1.68.Final.jar:4.1.68.Final] at io.netty.channel.DefaultChannelPipeline.addBefore(DefaultChannelPipeline.java:237) ~[netty-all-4.1.68.Final.jar:4.1.68.Final] at com.comphenix.protocol.injector.netty.PipelineProxy.addBefore(PipelineProxy.java:61) ~[ProtocolLib540.jar:?] at com.comphenix.protocol.injector.netty.ChannelInjector$3$1.addBefore(ChannelInjector.java:316) ~[ProtocolLib540.jar:?] at net.shortninja.staffplus.server.compatibility.v1_1x.Protocol_v1_18_R0.inject(Protocol_v1_18_R0.java:121) ~[staffplusplus-core-1.18.9.jar:?] at net.shortninja.staffplus.core.domain.player.listeners.PlayerJoin.onJoin(PlayerJoin.java:49) ~[staffplusplus-core-1.18.9.jar:?] at com.destroystokyo.paper.event.executor.asm.generated.GeneratedEventExecutor1360.execute(Unknown Source) ~[?:?] at org.bukkit.plugin.EventExecutor.lambda$create$1(EventExecutor.java:75) ~[paper-api-1.18.1-R0.1-SNAPSHOT.jar:?] at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:80) ~[paper-api-1.18.1-R0.1-SNAPSHOT.jar:git-Paper-200] at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70) ~[paper-api-1.18.1-R0.1-SNAPSHOT.jar:?] at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:629) ~[paper-api-1.18.1-R0.1-SNAPSHOT.jar:?] at net.minecraft.server.players.PlayerList.postChunkLoadJoin(PlayerList.java:363) ~[paper-1.18.1.jar:git-Paper-200] at net.minecraft.server.players.PlayerList.lambda$placeNewPlayer$1(PlayerList.java:305) ~[paper-1.18.1.jar:git-Paper-200] at net.minecraft.server.network.ServerGamePacketListenerImpl.tick(ServerGamePacketListenerImpl.java:305) ~[?:?] at net.minecraft.network.Connection.tick(Connection.java:526) ~[?:?] at net.minecraft.server.network.ServerConnectionListener.tick(ServerConnectionListener.java:201) ~[?:?] at net.minecraft.server.MinecraftServer.tickChildren(MinecraftServer.java:1636) ~[paper-1.18.1.jar:git-Paper-200] at net.minecraft.server.dedicated.DedicatedServer.tickChildren(DedicatedServer.java:480) ~[paper-1.18.1.jar:git-Paper-200] at net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:1470) ~[paper-1.18.1.jar:git-Paper-200] at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1264) ~[paper-1.18.1.jar:git-Paper-200] at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:317) ~[paper-1.18.1.jar:git-Paper-200] at java.lang.Thread.run(Thread.java:833) ~[?:?]