PaperMC/patches/server/0343-Don-t-crash-if-player-is-attempted-to-be-removed-fro.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Sat, 18 Apr 2020 15:59:41 -0400
Subject: [PATCH] Don't crash if player is attempted to be removed from
untracked chunk.
I suspect it deals with teleporting as it uses players current x/y/z
diff --git a/src/main/java/net/minecraft/server/level/DistanceManager.java b/src/main/java/net/minecraft/server/level/DistanceManager.java
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index 3d46412b307f08968bb9b96c0649e0405813462e..56aa26bb8d0bfbd3c799163fa620259e6455c89b 100644
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--- a/src/main/java/net/minecraft/server/level/DistanceManager.java
+++ b/src/main/java/net/minecraft/server/level/DistanceManager.java
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@@ -270,8 +270,8 @@ public abstract class DistanceManager {
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ObjectSet<ServerPlayer> objectset = (ObjectSet) this.playersPerChunk.get(i);
if (objectset == null) return; // CraftBukkit - SPIGOT-6208
- objectset.remove(player);
- if (objectset.isEmpty()) {
+ if (objectset != null) objectset.remove(player); // Paper - some state corruption happens here, don't crash, clean up gracefully
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+ if (objectset == null || objectset.isEmpty()) { // Paper
this.playersPerChunk.remove(i);
this.naturalSpawnChunkCounter.update(i, Integer.MAX_VALUE, false);
this.playerTicketManager.update(i, Integer.MAX_VALUE, false);