zabbix-2.4.5 and php7

[12-Jul-2015 20:30:01 Europe/Berlin] PHP Fatal error:  Uncaught TypeError: Argument 2 passed to CFrontendApiWrapper::callMethod() must be of the type array, boolean given, called in /var/www/zabbix.domain.de/htdocs/include/classes/api/wrappers/CApiWrapper.php on line 82 and defined in /var/www/zabbix.domain.de/htdocs/include/classes/api/wrappers/CFrontendApiWrapper.php:61
Stack trace:
#0 /var/www/zabbix.domain.de/htdocs/include/classes/api/wrappers/CApiWrapper.php(82): CFrontendApiWrapper->callMethod('logout', false)
#1 /var/www/zabbix.domain.de/htdocs/include/classes/user/CWebUser.php(88): CApiWrapper->__call('logout', Array)
#2 /var/www/zabbix.domain.de/htdocs/index.php(49): CWebUser::logout()
#3 {main}
  thrown in /var/www/zabbix.domain.de/htdocs/include/classes/api/wrappers/CFrontendApiWrapper.php on line 61