PaperMC/patches/server/0339-Fix-MC-158900.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Tue, 13 Aug 2019 06:35:17 -0700
Subject: [PATCH] Fix MC-158900

The problem was we were checking isExpired() on the entry, but if it
was expired at that point, then it would be null.

diff --git a/src/main/java/net/minecraft/server/players/PlayerList.java b/src/main/java/net/minecraft/server/players/PlayerList.java
index 2278153bd4113933a106f60f76a1d342684c272e..494b18a3dfa05b5e6ecbb9b99abf06bfe6e1d166 100644
--- a/src/main/java/net/minecraft/server/players/PlayerList.java
+++ b/src/main/java/net/minecraft/server/players/PlayerList.java
@@ -606,8 +606,10 @@ public abstract class PlayerList {
         Player player = entity.getBukkitEntity();
         PlayerLoginEvent event = new PlayerLoginEvent(player, hostname, ((java.net.InetSocketAddress) socketaddress).getAddress(), ((java.net.InetSocketAddress) loginlistener.connection.getRawAddress()).getAddress());
 
-        if (this.getBans().isBanned(gameprofile) && !this.getBans().get(gameprofile).hasExpired()) {
-            UserBanListEntry gameprofilebanentry = (UserBanListEntry) this.bans.get(gameprofile);
+        // Paper start - Fix MC-158900
+        UserBanListEntry gameprofilebanentry;
+        if (getBans().isBanned(gameprofile) && (gameprofilebanentry = getBans().get(gameprofile)) != null) {
+            // Paper end
 
             chatmessage = new TranslatableComponent("multiplayer.disconnect.banned.reason", new Object[]{gameprofilebanentry.getReason()});
             if (gameprofilebanentry.getExpires() != null) {