Index: trunk/src/org/openstreetmap/josm/gui/oauth/OsmOAuthAuthorizationClient.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/oauth/OsmOAuthAuthorizationClient.java	(revision 3493)
+++ trunk/src/org/openstreetmap/josm/gui/oauth/OsmOAuthAuthorizationClient.java	(revision 3494)
@@ -130,5 +130,5 @@
             monitor.beginTask("");
             monitor.indeterminateSubTask(tr("Retrieving OAuth Request Token from ''{0}''", oauthProviderParameters.getRequestTokenUrl()));
-            provider.retrieveRequestToken(consumer, null);
+            provider.retrieveRequestToken(consumer, "");
             return OAuthToken.createToken(consumer);
         } catch(OAuthCommunicationException e){