Fatal error: Timezone database is corrupt. Please file a bug report as this should never happen in Unknown on line 0

Fatal error: Uncaught Exception: DateTimeZone::__construct(): Unknown or bad timezone (Europe/Warsaw) in /www/wp-includes/functions.php:153 Stack trace: #0 /www/wp-includes/functions.php(153): DateTimeZone->__construct() #1 /www/wp-includes/functions.php(88): wp_timezone() #2 /www/wp-includes/functions.php(2551): current_time() #3 /www/wp-includes/functions.php(2410): _wp_upload_dir() #4 /www/wp-includes/functions.php(2356): wp_upload_dir() #5 /www/wp-content/plugins/contact-form-7/includes/functions.php(62): wp_get_upload_dir() #6 /www/wp-content/plugins/contact-form-7/includes/file.php(344): wpcf7_upload_dir() #7 /www/wp-content/plugins/contact-form-7/includes/file.php(365): wpcf7_upload_tmp_dir() #8 /www/wp-includes/class-wp-hook.php(351): wpcf7_cleanup_upload_files() #9 /www/wp-includes/class-wp-hook.php(377): WP_Hook->apply_filters() #10 /www/wp-includes/plugin.php(523): WP_Hook->do_action() #11 /www/wp-includes/load.php(1308): do_action() #12 [internal function]: shutdown_action_hook() #13 {main} thrown in /www/wp-includes/functions.php on line 153