PHP Warning after upgrading to WordPress 5.1

Updated WordPress to version 5.1 and PHP Warning appeared:

session_start(): Cannot send session cookie - headers already sent in /wp-content/plugins/ip2location-country-blocker/ip2location-country-blocker.php on line 1963
session_start(): Cannot send session cache limiter - headers already sent in /wp-content/plugins/ip2location-country-blocker/ip2location-country-blocker.php on line 1963
Cannot modify header information - headers already sent in /wp-content/plugins/ip2location-country-blocker/ip2location-country-blocker.php on line 1353

We managed to solve the problem by adding a condition to the function start_session in the file
/wp-content/plugins/ip2location-country-blocker/ip2location-country-blocker.php on line 1963

The solution looks like this:

	private function start_session(){
             if ( !defined( 'DOING_CRON' ) ){
                 session_id() or session_start();
             }
	}

• This topic was modified 5 years, 8 months ago by shkuropat.