Title: Error when running backup
Last modified: June 8, 2022

---

# Error when running backup

 *  Resolved [hungvuviet](https://wordpress.org/support/users/hungvuviet/)
 * (@hungvuviet)
 * [4 years ago](https://wordpress.org/support/topic/error-when-running-backup/)
 * Database is normal. I re-run many times but it’s still fail. I get this log:
 *     ```
       0065.186 (0) Adding batch to zip file (UpdraftPlus_ZipArchive): over 1000 files added on this batch (14.4 MB, 15935 files batched, 1001 (12843) added so far); re-opening (prior size: 46781.9 KB)
       0087.694 (0) PHP event: code E_WARNING: mysqli_real_connect(): Headers and client library minor version mismatch. Headers:100038 Library:50564 (line 1756, wp-includes/wp-db.php)
       0087.696 (0) PHP Fatal error (Error) has occurred. Error Message: mysqli object is not fully initialized (Code: 0, line 1260 in /home/vvhung/domains/vuihocweb.club/public_html/wp-includes/wp-db.php) Backtrace: #0 wp-includes/wp-db.php(1260): mysqli_real_escape_string(), #1 wp-includes/wp-db.php(1346): wpdb->_real_escape(), #2 [internal function]: wpdb->escape_by_ref(), #3 wp-includes/wp-db.php(1509): array_walk(), #4 wp-includes/wp-db.php(2469): wpdb->prepare(), #5 wp-includes/option.php(493): wpdb->update(), #6 wp-content/plugins/updraftplus/options.php(75): update_option(), #7 wp-content/plugins/updraftplus/class-updraftplus.php(1121): UpdraftPlus_Options::update_updraft_option(), #8 wp-content/plugins/updraftplus/class-updraftplus.php(2134): UpdraftPlus->log(), #9 [internal function]: UpdraftPlus->php_error(), #10 wp-includes/wp-db.php(1756): mysqli_real_connect(), #11 wp-includes/wp-db.php(1937): wpdb->db_connect(), #12 wp-includes/wp-db.php(2074): wpdb->check_connection(), #13 wp-includes/wp-db.php(2469): wpdb->query(), #14 wp-includes/option.php(493): wpdb->update(), #15 wp-includes/option.php(1783): update_option(), #16 wp-includes/option.php(1353): update_network_option(), #17 wp-content/plugins/updraftplus/class-updraftplus.php(2733): update_site_option(), #18 wp-content/plugins/updraftplus/includes/class-job-scheduler.php(24): UpdraftPlus->jobdata_set(), #19 wp-content/plugins/updraftplus/includes/class-job-scheduler.php(63): UpdraftPlus_Job_Scheduler::record_still_alive(), #20 wp-content/plugins/updraftplus/backup.php(4033): UpdraftPlus_Job_Scheduler::something_useful_happened(), #21 wp-content/plugins/updraftplus/backup.php(3605): UpdraftPlus_Backup->makezip_addfiles(), #22 wp-content/plugins/updraftplus/backup.php(309): UpdraftPlus_Backup->make_zipfile(), #23 wp-content/plugins/updraftplus/backup.php(1425): UpdraftPlus_Backup->create_zip(), #24 wp-content/plugins/updraftplus/backup.php(1482): UpdraftPlus_Backup->backup_dirs(), #25 wp-content/plugins/updraftplus/class-updraftplus.php(2443): UpdraftPlus_Backup->resumable_backup_of_files(), #26 wp-content/plugins/updraftplus/class-updraftplus.php(3449): UpdraftPlus->backup_resume(), #27 wp-content/plugins/updraftplus/class-updraftplus.php(3000): UpdraftPlus->boot_backup(), #28 wp-includes/class-wp-hook.php(307): UpdraftPlus->backup_all(), #29 wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(), #30 wp-includes/plugin.php(474): WP_Hook->do_action(), #31 wp-content/plugins/updraftplus/admin.php(2394): do_action(), #32 wp-content/plugins/updraftplus/includes/class-commands.php(131): UpdraftPlus_Admin->request_backupnow(), #33 wp-content/plugins/updraftplus/admin.php(1692): UpdraftPlus_Commands->backupnow(), #34 wp-includes/class-wp-hook.php(307): UpdraftPlus_Admin->updraft_ajax_handler(), #35 wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(), #36 wp-includes/plugin.php(474): WP_Hook->do_action(), #37 wp-admin/admin-ajax.php(187): do_action(), #38 {main}
       0087.783 (0) An error condition has occurred for the first time during this job
       ```
   
 * log file [here](https://drive.google.com/file/d/1JM-NTsFcP1MkVsEyBLDbHBkIoj4f7Sj3/view?usp=sharing)
    -  This topic was modified 4 years ago by [hungvuviet](https://wordpress.org/support/users/hungvuviet/).
    -  This topic was modified 4 years ago by [hungvuviet](https://wordpress.org/support/users/hungvuviet/).

Viewing 9 replies - 1 through 9 (of 9 total)

 *  Plugin Support [vupdraft](https://wordpress.org/support/users/vupdraft/)
 * (@vupdraft)
 * [4 years ago](https://wordpress.org/support/topic/error-when-running-backup/#post-15720920)
 * Hi,
 * What php version are you using?
 *  Thread Starter [hungvuviet](https://wordpress.org/support/users/hungvuviet/)
 * (@hungvuviet)
 * [4 years ago](https://wordpress.org/support/topic/error-when-running-backup/#post-15721441)
 * PHP Version 8.0.10
 * It worked normally when I started using. But recently since I disable cronjob,
   it shows the warning: `Warning: WordPress has a number (31) of scheduled tasks
   which are overdue.`. and fail to run any backup. I stopped scheduled backup but
   do not know how to fix the current error.
 *  Thread Starter [hungvuviet](https://wordpress.org/support/users/hungvuviet/)
 * (@hungvuviet)
 * [4 years ago](https://wordpress.org/support/topic/error-when-running-backup/#post-15721560)
 * Is this log related to PHP version?
 * mysqli_real_connect(): Headers and client library minor version mismatch. Headers:
   100038 Library:50564 (line 1756, wp-includes/wp-db.php)
 * Do you know which is the best PHP version for WordPress now?
    -  This reply was modified 4 years ago by [hungvuviet](https://wordpress.org/support/users/hungvuviet/).
 *  Thread Starter [hungvuviet](https://wordpress.org/support/users/hungvuviet/)
 * (@hungvuviet)
 * [3 years, 12 months ago](https://wordpress.org/support/topic/error-when-running-backup/#post-15722165)
 * I down it to PHP 7.4 and it works now. just wonder how to clean `Warning: WordPress
   has a number (31) of scheduled tasks which are overdue.`
 *  Plugin Contributor [bcrodua](https://wordpress.org/support/users/bcrodua/)
 * (@bcrodua)
 * [3 years, 12 months ago](https://wordpress.org/support/topic/error-when-running-backup/#post-15726662)
 * Hi,
 * Apologies for the late reply.
 * It sounds like your WordPress scheduler may be broken.
    To confirm this, can 
   you install a plugin called WP-Crontrol? This will allow you to see all scheduled
   tasks that WordPress is handling. Then could you navigate to Tools->Cron Event
   and you’ll be able to work out if the scheduler is working correctly.
 * We also have a guide to this issue in our FAQs [here](http://updraftplus.com/faqs/my-scheduled-backups-do-nothing-backup-now-stops-midway/).
   This provides some further advice that you can try.
 * Thanks,
    Bryle
 *  Thread Starter [hungvuviet](https://wordpress.org/support/users/hungvuviet/)
 * (@hungvuviet)
 * [3 years, 12 months ago](https://wordpress.org/support/topic/error-when-running-backup/#post-15727233)
 * Thanks, it says calling wp-cron.php got 403 error. I tried to using server cron.
   Do you think I can follow this: [https://developer.wordpress.org/plugins/cron/hooking-wp-cron-into-the-system-task-scheduler/](https://developer.wordpress.org/plugins/cron/hooking-wp-cron-into-the-system-task-scheduler/)
 *  Plugin Support [vupdraft](https://wordpress.org/support/users/vupdraft/)
 * (@vupdraft)
 * [3 years, 11 months ago](https://wordpress.org/support/topic/error-when-running-backup/#post-15735302)
 * Hi,
 * Can you try activating the alternate cron by adding the following to your wp-
   config.php;
 * define(‘ALTERNATE_WP_CRON’, true);
 *  Thread Starter [hungvuviet](https://wordpress.org/support/users/hungvuviet/)
 * (@hungvuviet)
 * [3 years, 11 months ago](https://wordpress.org/support/topic/error-when-running-backup/#post-15736762)
 * Thanks, I already successfully set up server cron to run updraft backup.
 *  Thread Starter [hungvuviet](https://wordpress.org/support/users/hungvuviet/)
 * (@hungvuviet)
 * [3 years, 11 months ago](https://wordpress.org/support/topic/error-when-running-backup/#post-15739451)
 * Close this thread. Thank everyone!

Viewing 9 replies - 1 through 9 (of 9 total)

The topic ‘Error when running backup’ is closed to new replies.

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 * 9 replies
 * 3 participants
 * Last reply from: [hungvuviet](https://wordpress.org/support/users/hungvuviet/)
 * Last activity: [3 years, 11 months ago](https://wordpress.org/support/topic/error-when-running-backup/#post-15739451)
 * Status: resolved