Index: /applications/editors/josm/plugins/rasterfilters/src/org/openstreetmap/josm/plugins/rasterfilters/gui/FilterGuiListener.java
===================================================================
--- /applications/editors/josm/plugins/rasterfilters/src/org/openstreetmap/josm/plugins/rasterfilters/gui/FilterGuiListener.java	(revision 31504)
+++ /applications/editors/josm/plugins/rasterfilters/src/org/openstreetmap/josm/plugins/rasterfilters/gui/FilterGuiListener.java	(revision 31505)
@@ -136,5 +136,6 @@
 
 		// notify about state is changed now so send msg to FiltersManager
-		handler.filterStateChanged(filterId, filterState);
+		if (handler != null)
+			handler.filterStateChanged(filterId, filterState);
 
 	}