PHP Fatal error: Uncaught Error: Call to a member function set_data(

Hi,

I get this Fatal error on the errog log.

PHP Fatal error: Uncaught Error: Call to a member function set_data() on boolean in /var/www/html/wp-content/plugins/wp-native-php-sessions/callbacks.php:100\nStack trace:\n#0 [internal function]: _pantheon_session_write(‘0f8a6d581a25bea…’, ”)\n#1 /var/www/html/wp-includes/plugin.php(524): session_write_close(”)\n#2 /var/www/html/wp-includes/load.php(671): do_action(‘shutdown’)\n#3 [internal function]: shutdown_action_hook()\n#4 {main}\n thrown in /var/www/html/wp-content/plugins/wp-native-php-sessions/callbacks.php on line 100, referer:

Do you know what can be the possible cause for this?

Thanks!