Index: /applications/editors/josm/plugins/reltoolbox/src/relcontext/actions/TheRing.java
===================================================================
--- /applications/editors/josm/plugins/reltoolbox/src/relcontext/actions/TheRing.java	(revision 26928)
+++ /applications/editors/josm/plugins/reltoolbox/src/relcontext/actions/TheRing.java	(revision 26929)
@@ -117,5 +117,5 @@
 	    while( pos > 0 && nodes2.contains(nodes1.get(pos)) )
 		pos--;
-	    if( pos == 0 ) {
+	    if( pos == 0 && nodes1.size() == nodes2.size() ) {
 		JOptionPane.showMessageDialog(Main.parent, "Two rings are equal, and this must not be.", "Multipolygon from rings", JOptionPane.ERROR_MESSAGE);
 		return null;