When you finish a parley, or cancel one via farewelling before its over, that parley should not be available for a set amount of time. If you can repeat the same one over and over, its incorrect.
I believe the standard wait time was roughly 5 mins or so.
server_id: 1
server name: New Telon
chunk: Isle of Dawn (1)
location: -16163 19103 1347
severity: Severe (e.g. Exploitable)
reproduce: [phpBB Debug] PHP Warning: in file /usr/www/vgo/www/modules/blocks/BugTracker.php on line 1429: Undefined array key 255