NotificationSettings index error

Sun, 11 Jun 2017 12:29:28 +0000
Message: PHP notice in file /var/www/vhosts/xiaomi-miui.gr/xiaomi-miui.gr/community/wcf/templates/compiled/33_wcf_9_notificationSettings.php (5064): Undefined offset: 41
File: /var/www/vhosts/xiaomi-miui.gr/xiaomi-miui.gr/community/wcf/lib/system/WCF.class.php (309)
PHP version: 7.1.5
WCF version: 2.1.15 (Typhoon)
Request URI: /community/index.php/NotificationSettings/
Referrer: 
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36
Information: ""
Stacktrace: 
  #0 /var/www/vhosts/xiaomi-miui.gr/xiaomi-miui.gr/community/wcf/templates/compiled/33_wcf_9_notificationSettings.php(5064): wcf\system\WCF::handleError(8, 'Undefined offse...', '/var/www/vhosts...', 5064, Array)
  #1 /var/www/vhosts/xiaomi-miui.gr/xiaomi-miui.gr/community/wcf/lib/system/template/TemplateEngine.class.php(323): include('/var/www/vhosts...')
  #2 /var/www/vhosts/xiaomi-miui.gr/xiaomi-miui.gr/community/wcf/lib/page/AbstractPage.class.php(305): wcf\system\template\TemplateEngine->display('notificationSet...', 'wcf')
  #3 /var/www/vhosts/xiaomi-miui.gr/xiaomi-miui.gr/community/wcf/lib/form/NotificationSettingsForm.class.php(177): wcf\page\AbstractPage->show()
  #4 /var/www/vhosts/xiaomi-miui.gr/xiaomi-miui.gr/community/wcf/lib/page/AbstractPage.class.php(100): wcf\form\NotificationSettingsForm->show()
  #5 /var/www/vhosts/xiaomi-miui.gr/xiaomi-miui.gr/community/wcf/lib/system/request/Request.class.php(58): wcf\page\AbstractPage->__run()
  #6 /var/www/vhosts/xiaomi-miui.gr/xiaomi-miui.gr/community/wcf/lib/system/request/RequestHandler.class.php(139): wcf\system\request\Request->execute()
  #7 /var/www/vhosts/xiaomi-miui.gr/xiaomi-miui.gr/community/index.php(10): wcf\system\request\RequestHandler->handle('wbb')
  #8 {main}