Fix missing null check in ChunkGenerator#findNearestMapStructure

patches/server/0917-Fix-missing-null-check-in-ChunkGenerator-findNearest.patch

@@ -0,0 +1,19 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Shane Freeder <theboyetronic@gmail.com>
+Date: Mon, 20 Jun 2022 14:59:38 +0100
+Subject: [PATCH] Fix missing null check in
+ ChunkGenerator#findNearestMapStructure
+
+
+diff --git a/src/main/java/net/minecraft/world/level/chunk/ChunkGenerator.java b/src/main/java/net/minecraft/world/level/chunk/ChunkGenerator.java
+index cdfe2589ca598263d58a11a978e176ab3ecb87e6..264ca51c2f2a5ff69688372b71ad7355366bac1a 100644
+--- a/src/main/java/net/minecraft/world/level/chunk/ChunkGenerator.java
++++ b/src/main/java/net/minecraft/world/level/chunk/ChunkGenerator.java
+@@ -353,6 +353,7 @@ public abstract class ChunkGenerator {
+                 if (structureplacement1 instanceof ConcentricRingsStructurePlacement) {
+                     ConcentricRingsStructurePlacement concentricringsstructureplacement = (ConcentricRingsStructurePlacement) structureplacement1;
+                     Pair<BlockPos, Holder<Structure>> pair1 = this.getNearestGeneratedStructure((Set) entry.getValue(), world, structuremanager, center, skipReferencedStructures, concentricringsstructureplacement);
++                    if (pair1 == null) continue; // Paper
+                     BlockPos blockposition1 = (BlockPos) pair1.getFirst();
+                     double d1 = center.distSqr(blockposition1);
+