From 4b15439e03f05fdb5454bd2a24000984e519d6e0 Mon Sep 17 00:00:00 2001
From: wizjany <wizjany@gmail.com>
Date: Sat, 25 May 2019 00:35:12 -0400
Subject: [PATCH] Don't attempt to update empty or invalid flower pots.

---
 .../io/legacycompat/FlowerPotCompatibilityHandler.java       | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/worldedit-core/src/main/java/com/sk89q/worldedit/extent/clipboard/io/legacycompat/FlowerPotCompatibilityHandler.java b/worldedit-core/src/main/java/com/sk89q/worldedit/extent/clipboard/io/legacycompat/FlowerPotCompatibilityHandler.java
index df18a95da..92e998f75 100644
--- a/worldedit-core/src/main/java/com/sk89q/worldedit/extent/clipboard/io/legacycompat/FlowerPotCompatibilityHandler.java
+++ b/worldedit-core/src/main/java/com/sk89q/worldedit/extent/clipboard/io/legacycompat/FlowerPotCompatibilityHandler.java
@@ -41,6 +41,9 @@ public class FlowerPotCompatibilityHandler implements NBTCompatibilityHandler {
         Tag item = values.get("Item");
         if (item instanceof StringTag) {
             String id = ((StringTag) item).getValue();
+            if (id.isEmpty()) {
+                return (B) BlockTypes.FLOWER_POT.getDefaultState();
+            }
             int data = 0;
             Tag dataTag = values.get("Data");
             if (dataTag instanceof IntTag) {
@@ -75,7 +78,7 @@ public class FlowerPotCompatibilityHandler implements NBTCompatibilityHandler {
                 break;
         }
         String plantedName = null;
-        if (newId == 0) {
+        if (newId == 0 && id.startsWith("minecraft:")) {
             plantedName = id.substring(10);
         } else {
             BlockState plantedWithData = LegacyMapper.getInstance().getBlockFromLegacy(newId, data);