From 7cf093ad40327a57936ea64affc5c7dee574fa18 Mon Sep 17 00:00:00 2001
From: sk89q <the.sk89q@gmail.com>
Date: Fri, 28 Feb 2014 16:20:54 -0800
Subject: [PATCH] Fixed pattern "X%Y" with no Y defined throwing an exception.

Fixes WORLDEDIT-2897.
---
 src/main/java/com/sk89q/worldedit/WorldEdit.java | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/main/java/com/sk89q/worldedit/WorldEdit.java b/src/main/java/com/sk89q/worldedit/WorldEdit.java
index 5ea1b938b..8da24d03c 100644
--- a/src/main/java/com/sk89q/worldedit/WorldEdit.java
+++ b/src/main/java/com/sk89q/worldedit/WorldEdit.java
@@ -713,8 +713,12 @@ public class WorldEdit {
             // Parse special percentage syntax
             if (s.matches("[0-9]+(\\.[0-9]*)?%.*")) {
                 String[] p = s.split("%");
-                chance = Double.parseDouble(p[0]);
-                block = getBlock(player, p[1]);
+                if (p.length < 2) {
+                    throw new UnknownItemException(s);
+                } else {
+                    chance = Double.parseDouble(p[0]);
+                    block = getBlock(player, p[1]);
+                }
             } else {
                 chance = 1;
                 block = getBlock(player, s);