--- pidgin-2.4.2/libpurple/protocols/jabber/auth.c	2008-05-06 14:04:00.000000000 +0200
+++ pidgin-2.4.3/libpurple/protocols/jabber/auth.c	2008-05-23 17:48:44.000000000 +0200
@@ -936,6 +945,7 @@
 					_("Invalid challenge from server"));
 			}
 			g_free(js->expected_rspauth);
+			js->expected_rspauth = NULL;
 		} else {
 			/* assemble a response, and send it */
 			/* see RFC 2831 */