--- a/plugins/mod_smacks.lua	Thu Dec 16 22:42:08 2021 +0100
+++ b/plugins/mod_smacks.lua	Thu Dec 16 22:59:51 2021 +0100
@@ -436,6 +436,10 @@
 		if session.destroyed then
 			session.log("debug", "The session has already been destroyed");
 			return
+		elseif not session.resumption_token then
+			-- This should normally not happen, the watchdog should be canceled from session:close()
+			session.log("debug", "The session has already been resumed or replaced");
+			return
 		end
 
 		session.log("debug", "Destroying session for hibernating too long");