hi all, I'm new with osticket, so please kindly help me with my issue below, thanks in advance.

[SELECT COUNT(DISTINCT CASE WHEN A2.state = 'open' AND A2.state = 'open' AND A2.id IN (2) AND A2.state = 'open' AND A1.ticket_id = Z1.ticket_id THEN A1.ticket_id END) AS q15, COUNT(DISTINCT CASE WHEN A2.id IN (2) THEN A1.ticket_id END) AS q16, COUNT(DISTINCT CASE WHEN A2.state = 'open' THEN A1.ticket_id END) AS q1, COUNT(DISTINCT CASE WHEN A2.state = 'open' AND A2.state = 'open' AND A1.isanswered = '0' THEN A1.ticket_id END) AS q2, COUNT(DISTINCT CASE WHEN (A1.team_id IN (1, 0) OR A1.staff_id IN (2)) AND A2.state = 'open' AND (A1.team_id IN (1, 0) OR A1.staff_id IN (2)) AND A2.state = 'open' AND A1.staff_id IN (2) THEN A1.ticket_id END) AS q6, COUNT(DISTINCT CASE WHEN A2.state = 'closed' AND A2.state = 'closed' AND A1.closed BETWEEN '2019-06-13 00:00:00' AND '2019-06-13 23:59:59' THEN A1.ticket_id END) AS q9, COUNT(DISTINCT CASE WHEN A2.state = 'open' AND A2.state = 'open' AND A1.isanswered = '1' THEN A1.ticket_id END) AS q3, COUNT(DISTINCT CASE WHEN (A1.team_id IN (1, 0) OR A1.staff_id IN (2)) AND A2.state = 'open' AND (A1.team_id IN (1, 0) OR A1.staff_id IN (2)) AND A2.state = 'open' AND NOT A1.staff_id IN (2) THEN A1.ticket_id END) AS q7, COUNT(DISTINCT CASE WHEN A2.state = 'closed' AND A2.state = 'closed' AND A1.closed BETWEEN '2019-06-12 00:00:00' AND '2019-06-12 23:59:59' THEN A1.ticket_id END) AS q10, COUNT(DISTINCT CASE WHEN A2.state = 'open' AND A2.state = 'open' AND A1.isoverdue = '1' THEN A1.ticket_id END) AS q4, COUNT(DISTINCT CASE WHEN (A1.team_id IN (1, 0) OR A1.staff_id IN (2)) AND A2.state = 'open' THEN A1.ticket_id END) AS q5, COUNT(DISTINCT CASE WHEN A2.state = 'closed' AND A2.state = 'closed' AND A1.closed BETWEEN '2019-06-10 00:00:00' AND '2019-06-16 23:59:59' THEN A1.ticket_id END) AS q11, COUNT(DISTINCT CASE WHEN A2.state = 'closed' THEN A1.ticket_id END) AS q8, COUNT(DISTINCT CASE WHEN A2.state = 'closed' AND A2.state = 'closed' AND A1.closed BETWEEN '2019-06-01 00:00:00' AND '2019-06-30 23:59:59' THEN A1.ticket_id END) AS q12, COUNT(DISTINCT CASE WHEN A2.state = 'closed' AND A2.state = 'closed' AND A1.closed BETWEEN '2019-04-01 00:00:00' AND '2019-06-30 23:59:59' THEN A1.ticket_id END) AS q13, COUNT(DISTINCT CASE WHEN A2.state = 'closed' AND A2.state = 'closed' AND A1.closed BETWEEN '2019-01-01 00:00:00' AND '2019-12-31 23:59:59' THEN A1.ticket_id END) AS q14 FROM ost_ticket A1 JOIN ost_ticket_status A2 ON (A1.status_id = A2.id) LEFT JOIN ost_thread A3 ON (A3.object_type = 'T' AND A1.ticket_id = A3.object_id) LEFT JOIN ost_thread_referral A4 ON (A3.id = A4.thread_id) LEFT JOIN ost_staff A5 ON (A4.object_type = 'S' AND A4.object_id = A5.staff_id) LEFT JOIN ost_team A6 ON (A4.object_type = 'E' AND A4.object_id = A6.team_id) LEFT JOIN ost_department A7 ON (A4.object_type = 'D' AND A4.object_id = A7.id) WHERE (A2.state = 'open' AND (A1.staff_id = 2 OR A5.staff_id = 2 OR A1.team_id IN (1) OR A6.team_id IN (1))) OR A1.dept_id IN (1) OR A7.id IN (1)]

Unknown column 'Z1.ticket_id' in 'field list' 
---- Backtrace ---- 
#0 (root)/include/mysqli.php(199): osTicket->logDBError('DB Error #1054', '[SELECT COUNT(D...') 
#1 (root)/include/class.orm.php(3455): db_query('SELECT COUNT(DI...', true, true) 
#2 (root)/include/class.orm.php(3502): MySqlExecutor->execute() 
#3 (root)/include/class.orm.php(2085): MySqlExecutor->getArray() 
#4 (root)/include/class.orm.php(2035): HashArrayIterator->{closure}() 
#5 (root)/include/class.orm.php(2014): CallbackSimpleIterator->next() 
#6 (root)/include/class.orm.php(2023): CallbackSimpleIterator->rewind() 
#7 (root)/include/class.orm.php(1695): CallbackSimpleIterator->valid() 
#8 (root)/include/class.orm.php(1705): CachedResultSet->fillTo(9223372036854775807) 
#9 (root)/include/class.orm.php(1328): CachedResultSet->asArray() 
#10 (root)/include/class.orm.php(1351): QuerySet->all() 
#11 (root)/include/class.search.php(925): QuerySet->one() 
#12 (root)/include/ajax.search.php(397): SavedQueue::counts(Object(StaffSession), true, Array) 
#13 (root)/include/class.dispatcher.php(145): SearchAjaxAPI->collectQueueCounts() 
#14 (root)/include/class.dispatcher.php(38): UrlMatcher->dispatch('counts', Array) 
#15 (root)/include/class.dispatcher.php(120): Dispatcher->resolve('counts', Array) 
#16 (root)/include/class.dispatcher.php(38): UrlMatcher->dispatch('/queue/counts', NULL) 
#17 (root)/scp/ajax.php(289): Dispatcher->resolve('/queue/counts') 
#18 {main}

Warm regards,
Sandy Hardja