--- icedtea-3.8.0/openjdk/jdk/src/share/classes/java/util/regex/PatternSyntaxException.java	2018-09-18 10:20:24.942414144 +0200
+++ icedtea-3.8.0/openjdk/jdk/src/share/classes/java/util/regex/PatternSyntaxException.java	2018-09-18 10:21:21.026719597 +0200
@@ -113,7 +113,7 @@
         }
         sb.append(nl);
         sb.append(pattern);
-        if (index >= 0) {
+        if (index >= 0 && pattern != null && index < pattern.length()) {
             sb.append(nl);
             for (int i = 0; i < index; i++) sb.append(' ');
             sb.append('^');