Index: trunk/src/org/openstreetmap/josm/actions/ImageryAdjustAction.java
===================================================================
--- trunk/src/org/openstreetmap/josm/actions/ImageryAdjustAction.java	(revision 13866)
+++ trunk/src/org/openstreetmap/josm/actions/ImageryAdjustAction.java	(revision 13867)
@@ -299,5 +299,7 @@
             }
             updateOffsetIntl();
-            layer.invalidate();
+            if (layer != null) {
+                layer.invalidate();
+            }
         }