Index: trunk/src/org/openstreetmap/josm/gui/bbox/SlippyMapBBoxChooser.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/bbox/SlippyMapBBoxChooser.java	(revision 4200)
+++ trunk/src/org/openstreetmap/josm/gui/bbox/SlippyMapBBoxChooser.java	(revision 4202)
@@ -235,5 +235,5 @@
                     Main.warn(ts.getAttributionLinkURL());*/
                 return true;
-            } else if(attrToUBounds.contains(p)) {
+            } else if(attrToUBounds != null && attrToUBounds.contains(p)) {
                 if(click)
                     Desktop.getDesktop().browse(new URI(ts.getTermsOfUseURL()));