Index: applications/viewer/jmapviewer/src/org/openstreetmap/gui/jmapviewer/AttributionSupport.java
===================================================================
--- applications/viewer/jmapviewer/src/org/openstreetmap/gui/jmapviewer/AttributionSupport.java	(revision 33320)
+++ applications/viewer/jmapviewer/src/org/openstreetmap/gui/jmapviewer/AttributionSupport.java	(revision 33332)
@@ -102,4 +102,8 @@
         g.setFont(ATTR_FONT);
         String attributionText = source.getAttributionText(zoom, topLeft, bottomRight);
+        if (attributionText == null) {
+            // In case attribution text has been forgotte, display URL
+            attributionText = source.getAttributionLinkURL();
+        }
         if (attributionText != null) {
             Rectangle2D stringBounds = g.getFontMetrics().getStringBounds(attributionText, g);