Index: trunk/src/org/openstreetmap/josm/gui/dialogs/relation/ReferringRelationsBrowser.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/dialogs/relation/ReferringRelationsBrowser.java	(revision 15677)
+++ trunk/src/org/openstreetmap/josm/gui/dialogs/relation/ReferringRelationsBrowser.java	(revision 15678)
@@ -6,4 +6,5 @@
 import java.awt.BorderLayout;
 import java.awt.FlowLayout;
+import java.awt.Rectangle;
 import java.awt.event.ActionEvent;
 import java.awt.event.MouseAdapter;
@@ -66,7 +67,9 @@
             public void mouseClicked(MouseEvent e) {
                 if (e.getClickCount() == 2
-                    && !e.isAltDown() && !e.isAltGraphDown() && !e.isControlDown() && !e.isMetaDown() && !e.isShiftDown()
-                    && referrers.getCellBounds(referrers.getSelectedIndex(), referrers.getSelectedIndex()).contains(e.getPoint())) {
-                    editAction.actionPerformed(new ActionEvent(e.getSource(), ActionEvent.ACTION_PERFORMED, null));
+                    && !e.isAltDown() && !e.isAltGraphDown() && !e.isControlDown() && !e.isMetaDown() && !e.isShiftDown()) {
+                    Rectangle cellBounds = referrers.getCellBounds(referrers.getSelectedIndex(), referrers.getSelectedIndex());
+                    if (cellBounds != null && cellBounds.contains(e.getPoint())) {
+                        editAction.actionPerformed(new ActionEvent(e.getSource(), ActionEvent.ACTION_PERFORMED, null));
+                    }
                 }
             }
@@ -86,4 +89,7 @@
     }
 
+    /**
+     * Initializes the model with layer data.
+     */
     public void init() {
         model.populate(getLayer().data);