Index: trunk/src/org/openstreetmap/josm/gui/io/UploadDialog.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/io/UploadDialog.java	(revision 10104)
+++ trunk/src/org/openstreetmap/josm/gui/io/UploadDialog.java	(revision 10105)
@@ -509,5 +509,5 @@
             if (!s.isEmpty()) {
                 UnicodeBlock block = Character.UnicodeBlock.of(s.charAt(0));
-                if (block.toString().contains("CJK")) {
+                if (block != null && block.toString().contains("CJK")) {
                     result = s.length() < 4;
                 } else {