Index: /trunk/src/org/openstreetmap/josm/actions/OpenFileAction.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/actions/OpenFileAction.java	(revision 1572)
+++ /trunk/src/org/openstreetmap/josm/actions/OpenFileAction.java	(revision 1573)
@@ -88,4 +88,5 @@
                     j = notes.indexOf('\n', j + 1);
                 }
+                j = j >= 0 ? j : notes.length();
                 JOptionPane.showMessageDialog(Main.parent, notes.substring(0, j));
             }