DB Error: Illegal mix of collations (latin1_swedish_ci,IMPLICIT) and (utf8_general_ci,COERCIBLE) for operation '='

Stack Trace:

File: /var/www/periodicos/public_html/classes/issue/IssueDAO.inc.php line 131
Function: DAO->retrieve("SELECT i.* FROM issues i INNER JOIN issue_settings ist ON i.i...", Array(3))

File: /var/www/periodicos/public_html/classes/issue/IssueDAO.inc.php line 96
Function: IssueDAO->getIssuesBySetting("pub-id::publisher-id", "Vol. 06, Nツコ 1(2015)", "6")

File: /var/www/periodicos/public_html/classes/issue/IssueDAO.inc.php line 182
Function: IssueDAO->getIssueByPubId("publisher-id", "Vol. 06, Nツコ 1(2015)", "6", False)

File: /var/www/periodicos/public_html/pages/issue/IssueHandler.inc.php line 288
Function: IssueDAO->getIssueByBestIssueId("Vol. 06, Nツコ 1(2015)", "6")

File: /var/www/periodicos/public_html/pages/issue/IssueHandler.inc.php line 85
Function: IssueHandler->validate(Object(Request), "Vol. 06, Nツコ 1(2015)")

File: (unknown) line (unknown)
Function: IssueHandler->view(Array(1), Object(Request))

File: /var/www/periodicos/public_html/lib/pkp/classes/core/PKPRouter.inc.php line 362
Function: call_user_func(Array(2), Array(1), Object(Request))

File: /var/www/periodicos/public_html/lib/pkp/classes/core/PKPPageRouter.inc.php line 220
Function: PKPRouter->_authorizeInitializeAndCallRequest(Array(2), Object(Request), Array(1), False)

File: /var/www/periodicos/public_html/lib/pkp/classes/core/Dispatcher.inc.php line 134
Function: PKPPageRouter->route(Object(Request))

File: /var/www/periodicos/public_html/lib/pkp/classes/core/PKPApplication.inc.php line 178
Function: Dispatcher->dispatch(Object(Request))

File: /var/www/periodicos/public_html/index.php line 64
Function: PKPApplication->execute()