Joomla 3.5.1 Na update niet meer inloggen via front en backe

Error displaying the error page: Illegal mix of collations (utf8_unicode_ci,IMPLICIT) and (utf8_general_ci,IMPLICIT) for operation '=' SQL=SELECT id, home, template, s.params FROM #__template_styles as s LEFT JOIN #__extensions as e ON e.element=s.template AND e.type='template' AND e.client_id=s.client_id WHERE s.client_id = 0 AND e.enabled = 1: Illegal mix of collations (utf8_unicode_ci,IMPLICIT) and (utf8_general_ci,IMPLICIT) for operation '=' SQL=SELECT id, home, template, s.params FROM #__template_styles as s LEFT JOIN #__extensions as e ON e.element=s.template AND e.type='template' AND e.client_id=s.client_id WHERE s.client_id = 0 AND e.enabled = 1