Index: applications/editors/josm/plugins/terracer/src/terracer/ReverseTerraceAction.java
===================================================================
--- applications/editors/josm/plugins/terracer/src/terracer/ReverseTerraceAction.java	(revision 17546)
+++ applications/editors/josm/plugins/terracer/src/terracer/ReverseTerraceAction.java	(revision 17707)
@@ -86,5 +86,5 @@
 					CollectBackReferencesVisitor v = new CollectBackReferencesVisitor(Main.main.getCurrentDataSet());
 					v.visit(n);
-					for (OsmPrimitive prim : v.data) {
+					for (OsmPrimitive prim : v.getData()) {
 						if (prim.keySet().contains("building") && prim instanceof Way) {
 							front.add((Way)prim);