From 4d3af9c19bfb1f9a02b19c968b22e5ef6d271a14 Mon Sep 17 00:00:00 2001
From: md_5 <git@md-5.net>
Date: Thu, 3 Mar 2016 16:38:57 +1100
Subject: [PATCH] SPIGOT-1677: Fix attributes with only single underscore.

---
 .../org/bukkit/craftbukkit/attribute/CraftAttributeMap.java | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/main/java/org/bukkit/craftbukkit/attribute/CraftAttributeMap.java b/src/main/java/org/bukkit/craftbukkit/attribute/CraftAttributeMap.java
index 0412470b3d..7c94acc5dd 100644
--- a/src/main/java/org/bukkit/craftbukkit/attribute/CraftAttributeMap.java
+++ b/src/main/java/org/bukkit/craftbukkit/attribute/CraftAttributeMap.java
@@ -29,8 +29,10 @@ public class CraftAttributeMap implements Attributable {
         StringBuilder sb = new StringBuilder(bukkit.toLowerCase());
 
         sb.setCharAt(first, '.');
-        sb.deleteCharAt(second);
-        sb.setCharAt(second, bukkit.charAt(second + 1));
+        if (second != -1) {
+            sb.deleteCharAt(second);
+            sb.setCharAt(second, bukkit.charAt(second + 1));
+        }
 
         return sb.toString();
     }