--- old/src/java.base/share/classes/sun/text/normalizer/Normalizer2.java	2018-03-12 15:28:13.000000000 +0530
+++ new/src/java.base/share/classes/sun/text/normalizer/Normalizer2.java	2018-03-12 15:28:12.000000000 +0530
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015, 2018 Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -135,8 +135,10 @@
             if(spanLength==src.length()) {
                 return (String)src;
             }
-            StringBuilder sb=new StringBuilder(src.length()).append(src, 0, spanLength);
-            return normalizeSecondAndAppend(sb, src.subSequence(spanLength, src.length())).toString();
+            if (spanLength != 0) {
+                StringBuilder sb=new StringBuilder(src.length()).append(src, 0, spanLength);
+                return normalizeSecondAndAppend(sb, src.subSequence(spanLength, src.length())).toString();
+            }
         }
         return normalize(src, new StringBuilder(src.length())).toString();
     }