--- a/plugins/mod_c2s.lua	Sun Feb 28 20:01:13 2016 +0100
+++ b/plugins/mod_c2s.lua	Wed Mar 02 16:32:37 2016 +0100
@@ -283,6 +283,7 @@
 	if session then
 		(session.log or log)("info", "Client disconnected: %s", err or "connection closed");
 		sm_destroy_session(session, err);
+		session.conn = nil;
 		sessions[conn]  = nil;
 	end
 end