Index: trunk/src/org/openstreetmap/josm/actions/CreateMultipolygonAction.java
===================================================================
--- trunk/src/org/openstreetmap/josm/actions/CreateMultipolygonAction.java	(revision 19065)
+++ trunk/src/org/openstreetmap/josm/actions/CreateMultipolygonAction.java	(revision 19066)
@@ -465,5 +465,10 @@
             String key = entry.getKey();
             String value = entry.getValue();
-            List<OsmPrimitive> affectedWays = innerWays.stream().filter(way -> value.equals(way.get(key))).collect(Collectors.toList());
+            List<OsmPrimitive> affectedWays;
+            if ("area".equals(key)) {
+                affectedWays = innerWays.stream().filter(way -> value.equals(way.get(key))).collect(Collectors.toList());
+            } else {
+                affectedWays = new ArrayList<>();
+            }
 
             if (moveTags) {