NPE when calling /unban with a wrong username

[svaningelgem]

So basically we used a non-existing username (by accident) and it threw this error:
Nothing too bad, just looks ugly :)

[16:52:43] [Server thread/ERROR]: Could not pass event RevokePunishmentEvent to AdvancedBan v2.3.0
java.lang.NullPointerException: Cannot invoke "com.mojang.authlib.GameProfile.getId()" because "gameProfile" is null
 at net.minecraft.server.players.UserBanList.getKeyForUser(UserBanList.java:29) ~[paper-1.21.jar:1.21-106-3a47518]
 at net.minecraft.server.players.UserBanList.getKeyForUser(UserBanList.java:10) ~[paper-1.21.jar:1.21-106-3a47518]
 at net.minecraft.server.players.StoredUserList.remove(StoredUserList.java:64) ~[paper-1.21.jar:1.21-106-3a47518]
 at org.bukkit.craftbukkit.ban.CraftProfileBanList.pardon(CraftProfileBanList.java:193) ~[paper-1.21.jar:1.21-106-3a47518]
 at org.bukkit.craftbukkit.ban.CraftProfileBanList.pardon(CraftProfileBanList.java:162) ~[paper-1.21.jar:1.21-106-3a47518]
 at AdvancedBan-Bundle-2.3.0-RELEASE.jar/me.leoko.advancedban.bukkit.listener.InternalListener.onRevokePunishment(InternalListener.java:36) ~[AdvancedBan-Bundle-2.3.0-RELEASE.jar:?]
 at com.destroystokyo.paper.event.executor.asm.generated.GeneratedEventExecutor123.execute(Unknown Source) ~[?:?]
 at org.bukkit.plugin.EventExecutor$2.execute(EventExecutor.java:77) ~[paper-api-1.21-R0.1-SNAPSHOT.jar:?]
 at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:80) ~[paper-api-1.21-R0.1-SNAPSHOT.jar:1.21-106-3a47518]
 at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70) ~[paper-api-1.21-R0.1-SNAPSHOT.jar:?]
 at io.papermc.paper.plugin.manager.PaperEventManager.callEvent(PaperEventManager.java:54) ~[paper-1.21.jar:1.21-106-3a47518]
 at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.callEvent(PaperPluginManagerImpl.java:131) ~[paper-1.21.jar:1.21-106-3a47518]
 at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:628) ~[paper-api-1.21-R0.1-SNAPSHOT.jar:?]
 at AdvancedBan-Bundle-2.3.0-RELEASE.jar/me.leoko.advancedban.bukkit.BukkitMethods.lambda$callRevokePunishmentEvent$8(BukkitMethods.java:375) ~[AdvancedBan-Bun...

[Hopefuls]

Looks to be more an issue towards Paper, the error is referring to AdvancedBan is attempting to unban a user through the paper API, which then seems to incorrectly parse it?

AdvancedBan should've long failed when the user is invalid and shouldn't get to the point the error provides. That means that AdvancedBan either succeeded in finding the player, or you're providing a username that was provided through the UUID configuration in the config.yml

[svaningelgem]

No, I didn't unban by UUID.

We have a player like _kynex_, and I mistakenly banned _kynex°. Afterwards I unbanned him and made the same mistake to unban _kynex°. That's when the error occurred.

[Hopefuls]

Yup then still an issue with your paper setup or you have configured something within the advancedban config.yml to define a custom uuid mode that gets user-information through your own api.

Is this reproducible in spigot?