From 6ddaeecc9118acd36f27fcc06680e76875e9ac56 Mon Sep 17 00:00:00 2001
From: Valery Pavlov <v.v.pavloff@gmail.com>
Date: Sat, 6 May 2017 16:41:36 +0300
Subject: [PATCH] fix NPE during compare

---
 .../main/java/org/apache/jsieve/comparators/AsciiCasemap.java   | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/core/src/main/java/org/apache/jsieve/comparators/AsciiCasemap.java b/core/src/main/java/org/apache/jsieve/comparators/AsciiCasemap.java
index 16b322e32..a43275b48 100644
--- a/core/src/main/java/org/apache/jsieve/comparators/AsciiCasemap.java
+++ b/core/src/main/java/org/apache/jsieve/comparators/AsciiCasemap.java
@@ -40,6 +40,8 @@ public AsciiCasemap() {
      * @see org.apache.jsieve.comparators.Equals#equals(String, String)
      */
     public boolean equals(String string1, String string2) {
+	if (string1 == null && string2 == null) return true;
+        if (string1 == null || string2 == null) return false;
         return ComparatorUtils.equals(string1.toUpperCase(), string2
                 .toUpperCase());
     }