--- a/plugins/mod_admin_adhoc.lua	Sun Sep 30 13:37:51 2018 +0200
+++ b/plugins/mod_admin_adhoc.lua	Sun Sep 30 13:38:33 2018 +0200
@@ -673,7 +673,7 @@
 		send_to_online(message);
 	end
 
-	timer_add_task(tonumber(fields.delay or "5"), function(time) prosody.shutdown("Shutdown by adhoc command") end);
+	timer_add_task(tonumber(fields.delay or "5"), function() prosody.shutdown("Shutdown by adhoc command") end);
 
 	return { status = "completed", info = "Server is about to shut down" };
 end);