adding additional triggers to an existing link fails (this output is with two additional triggers, it slightly differs with one additional trigger) :

Error in query [INSERT INTO sysmaps_link_triggers (linkid,triggerid,drawtype,color) VALUES ('1','12771','0','Red')] [Duplicate entry '1' for key 1]
Error in query [INSERT INTO sysmaps_link_triggers (linkid,triggerid,drawtype,color) VALUES ('1','12776','0','Dark Blue')] [Duplicate entry '1' for key 1]
Missing argument 2 for delete_link_trigger(), called in /srv/www/htdocs/zabbix/include/maps.inc.php on line 236 and defined[/srv/www/htdocs/zabbix/include/maps.inc.php:276]
Undefined variable: triggerid[/srv/www/htdocs/zabbix/include/maps.inc.php:277]
Error in query [DELETE FROM sysmaps_link_triggers WHERE linkid=1 AND triggerid=] [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1]