Index: trunk/src/org/openstreetmap/josm/actions/ImageryAdjustAction.java
===================================================================
--- trunk/src/org/openstreetmap/josm/actions/ImageryAdjustAction.java	(revision 7349)
+++ trunk/src/org/openstreetmap/josm/actions/ImageryAdjustAction.java	(revision 7350)
@@ -85,5 +85,7 @@
         super.exitMode();
         if (offsetDialog != null) {
-            layer.setOffset(oldDx, oldDy);
+            if (layer != null) {
+                layer.setOffset(oldDx, oldDy);
+            }
             offsetDialog.setVisible(false);
             offsetDialog = null;