Index: /applications/editors/josm/plugins/rasterfilters/src/org/openstreetmap/josm/plugins/rasterfilters/model/FiltersManager.java
===================================================================
--- /applications/editors/josm/plugins/rasterfilters/src/org/openstreetmap/josm/plugins/rasterfilters/model/FiltersManager.java	(revision 32752)
+++ /applications/editors/josm/plugins/rasterfilters/src/org/openstreetmap/josm/plugins/rasterfilters/model/FiltersManager.java	(revision 32753)
@@ -130,5 +130,7 @@
 		fp.setPreferredSize(new Dimension(300, fp.getNeededHeight()));
 
-		filter.changeFilterState(filterState.encodeJson());
+		if (filter != null) {
+		    filter.changeFilterState(filterState.encodeJson());
+		}
 		Main.getLayerManager().getActiveLayer().setFilterStateChanged();