Index: trunk/src/org/openstreetmap/josm/gui/io/UploadPrimitivesTask.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/io/UploadPrimitivesTask.java	(revision 19135)
+++ trunk/src/org/openstreetmap/josm/gui/io/UploadPrimitivesTask.java	(revision 19136)
@@ -79,4 +79,5 @@
         ensureParameterNotNull(strategy, "strategy");
         ensureParameterNotNull(changeset, "changeset");
+        ensureParameterNotNull(toUpload, "toUpload");
         this.toUpload = toUpload;
         this.numObjectsToUpload = toUpload.getSize();