--- a/mod_smacks/mod_smacks.lua	Mon Jan 30 04:15:58 2012 +0000
+++ b/mod_smacks/mod_smacks.lua	Mon Jan 30 04:20:24 2012 +0000
@@ -217,6 +217,7 @@
 	local id = stanza.attr.previd;
 	local original_session = session_registry[id];
 	if not original_session then
+		session.log("debug", "Tried to resume non-existent session with id %s", id);
 		session.send(st.stanza("failed", sm_attr)
 			:tag("item-not-found", { xmlns = xmlns_errors })
 		);