From 7a154d5c5085444bb41dc61fa8095c689d786aec Mon Sep 17 00:00:00 2001
From: Josh Roy <10731363+JRoy@users.noreply.github.com>
Date: Fri, 27 Nov 2020 13:07:41 -0500
Subject: [PATCH] Fix cast check (#4813)

---
 .../0556-Prevent-headless-pistons-from-being-created.patch  | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/Spigot-Server-Patches/0556-Prevent-headless-pistons-from-being-created.patch b/Spigot-Server-Patches/0556-Prevent-headless-pistons-from-being-created.patch
index 823bc6e570..4a559ed86c 100644
--- a/Spigot-Server-Patches/0556-Prevent-headless-pistons-from-being-created.patch
+++ b/Spigot-Server-Patches/0556-Prevent-headless-pistons-from-being-created.patch
@@ -23,7 +23,7 @@ index d86474a1a97597c14ea8a28444e2a5d82fcda2a7..e0422471776f34b8e3c753d855aa06f0
      public static int maxPlayerAutoSavePerTick = 10;
      private static void playerAutoSaveRate() {
 diff --git a/src/main/java/net/minecraft/server/Explosion.java b/src/main/java/net/minecraft/server/Explosion.java
-index 72de544c0782e4daff222a0ca04e5bc870cf148c..fe513a9470a0c474ca436ede4a5a7da476cf6c8d 100644
+index 72de544c0782e4daff222a0ca04e5bc870cf148c..5ca4d03215c979a4d122a32178a1859b4d9c3334 100644
 --- a/src/main/java/net/minecraft/server/Explosion.java
 +++ b/src/main/java/net/minecraft/server/Explosion.java
 @@ -135,6 +135,15 @@ public class Explosion {
@@ -32,8 +32,8 @@ index 72de544c0782e4daff222a0ca04e5bc870cf148c..fe513a9470a0c474ca436ede4a5a7da4
                                  set.add(blockposition);
 +                                // Paper start - prevent headless pistons from forming
 +                                if (!com.destroystokyo.paper.PaperConfig.allowHeadlessPistons && iblockdata.getBlock() == Blocks.MOVING_PISTON) {
-+                                    TileEntityPiston extension = (TileEntityPiston)this.world.getTileEntity(blockposition);
-+                                    if (extension.isHead()) {
++                                    TileEntity extension = this.world.getTileEntity(blockposition);
++                                    if (extension instanceof TileEntityPiston && ((TileEntityPiston) extension).isHead()) {
 +                                       EnumDirection direction = iblockdata.get(BlockPistonExtension.FACING);
 +                                       set.add(blockposition.shift(direction.opposite()));
 +                                    }