Database error - how to fix?

[UPDATE ost_user_email SET `address` =
'healthand*******@gmail.com' WHERE id = 181 LIMIT 1]

Duplicate entry 'healthand******@gmail.com' for key
'address'<br /> <br />

---- Backtrace ----<br />

#0 (root)/include/mysqli.php(177):
osTicket->logDBError('DB Error #1062', '[UPDATE ost_use...')<br />

#1 (root)/include/class.orm.php(221): db_query('UPDATE
ost_user...')<br />

#2 (root)/include/class.user.php(530): VerySimpleModel->save()<br
/>

#3 (root)/include/ajax.tickets.php(578):
User->updateInfo(Array, Array, true)<br />

#4 [internal function]:
TicketsAjaxAPI->updateUser('9087')<br />

#5 (root)/include/class.dispatcher.php(145):
call_user_func_array(Array, Array)<br />

#6 (root)/include/class.dispatcher.php(38):
UrlMatcher->dispatch('9087/user', Array)<br />

#7 (root)/include/class.dispatcher.php(120):
Dispatcher->resolve('9087/user', Array)<br />

#8 (root)/include/class.dispatcher.php(38):
UrlMatcher->dispatch('/tickets/9087/u...', NULL)<br />

#9 (root)/scp/ajax.php(186):
Dispatcher->resolve('/tickets/9087/u...')<br />

#10 {main}