Index: trunk/src/org/openstreetmap/josm/data/imagery/WMTSTileSource.java
===================================================================
--- trunk/src/org/openstreetmap/josm/data/imagery/WMTSTileSource.java	(revision 11815)
+++ trunk/src/org/openstreetmap/josm/data/imagery/WMTSTileSource.java	(revision 11816)
@@ -192,5 +192,5 @@
                                 return SelectLayerDialog.this.layers.get(rowIndex).getValue()
                                         .stream()
-                                        .map(x -> x.getUserTitle())
+                                        .map(Layer::getUserTitle)
                                         .collect(Collectors.joining(", ")); //this should be only one
                             case 1: