Fatal error: Uncaught TypeError: join(): If argument #1 ($separator) is of type string, argument #2 ($array) must be of type array, null given in /home/www/pages/Wiki/plugin/backup.inc.php:101
Stack trace:
#0 /home/www/pages/Wiki/plugin/backup.inc.php(101): join('', NULL)
#1 /home/www/pages/Wiki/lib/plugin.php(108): plugin_backup_action()
#2 /home/www/pages/Wiki/lib/pukiwiki.php(69): do_plugin_action('backup')
#3 /home/www/pages/Wiki/index.php(23): require('/home/www/pages...')
#4 {main}
thrown in /home/www/pages/Wiki/plugin/backup.inc.php on line 101