Index: /trunk/resources/data/validator/addresses.mapcss
===================================================================
--- /trunk/resources/data/validator/addresses.mapcss	(revision 16707)
+++ /trunk/resources/data/validator/addresses.mapcss	(revision 16708)
@@ -8,4 +8,10 @@
 way[addr:interpolation] {
     throwOther: tr("Way with {0}. Tag each housenumber separately if possible.", "{0.key}");
+}
+
+/* #19393 */
+way[addr:interpolation] >[index= 1] node[!addr:housenumber],
+way[addr:interpolation] >[index=-1] node[!addr:housenumber] {
+    throwWarning: tr("End node without housenumber in address interpolation.");
 }