From 5184216f2788fb1bd722dfe1ac53ee2f4c2f4177 Mon Sep 17 00:00:00 2001
From: md_5 <git@md-5.net>
Date: Sat, 27 Oct 2018 08:21:49 +1100
Subject: [PATCH] SPIGOT-4447: Clear error for people trying to set an item as
 a block

---
 src/main/java/org/bukkit/craftbukkit/block/CraftBlockState.java | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/main/java/org/bukkit/craftbukkit/block/CraftBlockState.java b/src/main/java/org/bukkit/craftbukkit/block/CraftBlockState.java
index 13ac9bf279..f432abe19b 100644
--- a/src/main/java/org/bukkit/craftbukkit/block/CraftBlockState.java
+++ b/src/main/java/org/bukkit/craftbukkit/block/CraftBlockState.java
@@ -124,6 +124,8 @@ public class CraftBlockState implements BlockState {
 
     public void setType(final Material type) {
         Preconditions.checkArgument(type != null, "Material cannot be null");
+        Preconditions.checkArgument(type.isBlock(), "Material must be a block!");
+
         if (this.getType() != type) {
             this.data = CraftMagicNumbers.getBlock(type).getBlockData();
         }