NoClassDefFoundError: FakeInventoryView during PluginDisableEvent on Paper 26.2

[gummiangler]

A NoClassDefFoundError is thrown for xyz.xenondevs.invui.internal.util.FakeInventoryView during the server shutdown sequence.

This issue only occurs if a player has an InvUI inventory/window actively open when the server stops or the plugin is disabled.

Error Log

[22:38:47 ERROR]: Could not pass event PluginDisableEvent to LobbyCore v1.0-SNAPSHOT
java.lang.NoClassDefFoundError: xyz/xenondevs/invui/internal/util/FakeInventoryView
        at xyz.xenondevs.invui.internal.menu.CustomContainerMenu$ContainerMenuProxy.getBukkitView(CustomContainerMenu.java:797)
        at org.bukkit.craftbukkit.event.CraftEventFactory.handleInventoryCloseEvent(CraftEventFactory.java:1602)
        at org.bukkit.craftbukkit.entity.CraftHumanEntity.closeInventory(CraftHumanEntity.java:598)
        at xyz.xenondevs.invui.window.AbstractWindow.close(AbstractWindow.java:587)
        at xyz.xenondevs.invui.window.WindowManager.lambda$new$0(WindowManager.java:29)
        at xyz.xenondevs.invui.InvUI.handlePluginDisable(InvUI.java:165)
Caused by: java.lang.ClassNotFoundException: xyz.xenondevs.invui.internal.util.FakeInventoryView
        at io.papermc.paper.plugin.entrypoint.classloader.PaperPluginClassLoader.loadClass(PaperPluginClassLoader.java:146)

[NichtStudioCode]

Is LobbyCore the plugin that uses InvUI?

Please provide more information on how to reproduce this issue

[R00tB33rMan]

The only instances of this I've seen correspond with improper imports of API access, so I'd assume this is probably not an InvUI-sided issue

[NichtStudioCode]

It could also be an issue with Paper closing plugin class loaders on shutdown (I don't really understand why they're still doing this)

[R00tB33rMan]

Very true. It's pretty bizarre. I suppose we'll see if the creator replies