Index: /trunk/src/org/openstreetmap/josm/actions/AddImageryLayerAction.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/actions/AddImageryLayerAction.java	(revision 15743)
+++ /trunk/src/org/openstreetmap/josm/actions/AddImageryLayerAction.java	(revision 15744)
@@ -97,5 +97,5 @@
     private static ImageryInfo convertImagery(ImageryInfo info) {
         try {
-            if (info.getUrl().contains("{time}")) {
+            if (info.getUrl() != null && info.getUrl().contains("{time}")) {
                 final String instant = Year.now().atDay(1).atStartOfDay(ZoneOffset.UTC).toInstant().toString();
                 final String example = String.join("/", instant, instant);