MediaWiki internal error.

Original exception: exception 'DBQueryError' with message 'A database error has occurred
Query: SELECT * FROM `protected_titles` WHERE pt_namespace = '0' AND pt_title = 'He:כירופרקטיקה'
Function: Title::getTitleProtection
Error: 1267 Illegal mix of collations (latin1_bin,IMPLICIT) and (utf8_general_ci,COERCIBLE) for operation '=' (localhost)
' in /var/www/vhosts/ourmed.org/httpdocs/includes/db/Database.php:576
Stack trace:
#0 /var/www/vhosts/ourmed.org/httpdocs/includes/db/Database.php(538): DatabaseBase->reportQueryError('Illegal mix of ...', 1267, 'SELECT * FROM...', 'Title::getTitle...', false)
#1 /var/www/vhosts/ourmed.org/httpdocs/includes/db/Database.php(874): DatabaseBase->query('SELECT * FROM...', 'Title::getTitle...')
#2 /var/www/vhosts/ourmed.org/httpdocs/includes/Title.php(1424): DatabaseBase->select('protected_title...', '*', Array, 'Title::getTitle...')
#3 /var/www/vhosts/ourmed.org/httpdocs/includes/Title.php(1976): Title->getTitleProtection()
#4 /var/www/vhosts/ourmed.org/httpdocs/includes/Title.php(2021): Title->loadRestrictions()
#5 /var/www/vhosts/ourmed.org/httpdocs/includes/Title.php(1314): Title->getRestrictions('edit')
#6 /var/www/vhosts/ourmed.org/httpdocs/includes/Title.php(1080): Title->getUserPermissionsErrorsInternal('edit', Object(User), true)
#7 /var/www/vhosts/ourmed.org/httpdocs/includes/EditPage.php(418): Title->getUserPermissionsErrors('edit', Object(User))
#8 /var/www/vhosts/ourmed.org/httpdocs/includes/EditPage.php(322): EditPage->getEditPermissionErrors()
#9 /var/www/vhosts/ourmed.org/httpdocs/includes/EditPage.php(271): EditPage->edit()
#10 /var/www/vhosts/ourmed.org/httpdocs/includes/Wiki.php(553): EditPage->submit()
#11 /var/www/vhosts/ourmed.org/httpdocs/includes/Wiki.php(70): MediaWiki->performAction(Object(OutputPage), Object(Article), Object(Title), Object(User), Object(WebRequest))
#12 /var/www/vhosts/ourmed.org/httpdocs/index.php(271): MediaWiki->performRequestForTitle(Object(Title), Object(Article), Object(OutputPage), Object(User), Object(WebRequest))
#13 {main}

Exception caught inside exception handler: exception 'DBUnexpectedError' with message 'Error in fetchRow(): Illegal mix of collations (latin1_bin,IMPLICIT) and (utf8_general_ci,COERCIBLE) for operation '=' (localhost)' in /var/www/vhosts/ourmed.org/httpdocs/includes/db/DatabaseMysql.php:170
Stack trace:
#0 /var/www/vhosts/ourmed.org/httpdocs/includes/Title.php(1426): DatabaseMysql->fetchRow(false)
#1 /var/www/vhosts/ourmed.org/httpdocs/includes/Title.php(1976): Title->getTitleProtection()
#2 /var/www/vhosts/ourmed.org/httpdocs/includes/Title.php(2021): Title->loadRestrictions()
#3 /var/www/vhosts/ourmed.org/httpdocs/includes/Skin.php(449): Title->getRestrictions('edit')
#4 /var/www/vhosts/ourmed.org/httpdocs/includes/OutputPage.php(2190): Skin::makeGlobalVariablesScript('ourmed')
#5 /var/www/vhosts/ourmed.org/httpdocs/includes/OutputPage.php(2133): OutputPage->getHeadScripts(Object(SkinOurmed))
#6 /var/www/vhosts/ourmed.org/httpdocs/includes/SkinTemplate.php(498): OutputPage->headElement(Object(SkinOurmed))
#7 /var/www/vhosts/ourmed.org/httpdocs/includes/OutputPage.php(1572): SkinTemplate->outputPage(Object(OutputPage))
#8 /var/www/vhosts/ourmed.org/httpdocs/includes/Exception.php(164): OutputPage->output()
#9 /var/www/vhosts/ourmed.org/httpdocs/includes/Exception.php(191): MWException->reportHTML()
#10 /var/www/vhosts/ourmed.org/httpdocs/includes/Exception.php(289): MWException->report()
#11 /var/www/vhosts/ourmed.org/httpdocs/includes/Exception.php(348): wfReportException(Object(DBQueryError))
#12 [internal function]: wfExceptionHandler(Object(DBQueryError))
#13 {main}