diff -r b8635ebd7f57 -r e41a6ea7fc0f net/xmppclient_listener.lua
--- a/net/xmppclient_listener.lua	Mon Nov 23 21:46:37 2009 +0500
+++ b/net/xmppclient_listener.lua	Tue Nov 24 22:42:08 2009 +0500
@@ -61,7 +61,7 @@
 		function session.data(conn, data)
 			local ok, err = parser:parse(data);
 			if ok then return; end
-			log("debug", "Received invalid XML (%s) %d bytes: %s", tostring(err), #data, data:sub(1, 300):gsub("[\r\n]+", " "));
+			log("debug", "Received invalid XML (%s) %d bytes: %s", tostring(err), #data, data:sub(1, 300):gsub("[\r\n]+", " "):gsub("[%z\1-\31]", "_"));
 			session:close("xml-not-well-formed");
 		end