9.8.3 crashed with white screen

Hello

a real bizaarre one as I have 9.8.3 working on other sites but this one crashed on me and I had to roll it back (I was not able to find older version of cerber to roll back to easily!)

[06-Jul-2026 11:02:03 UTC] PHP Fatal error: Uncaught Error: Call to undefined method mysqli_result::fetch_all() in /home/XXXX/public_html/wp-content/plugins/wp-cerber/includes/db-warp/CRB_Database.php:321
Stack trace:
#0 /home/XXXX/public_html/wp-content/plugins/wp-cerber/includes/db-warp/CRB_Database.php(292): CRB_Database->fetch_result_set()
#1 /home/XXXX/public_html/wp-content/plugins/wp-cerber/includes/db-warp/CRB_Schema_Manager.php(1041): CRB_Database->query()
#2 /home/XXXX/public_html/wp-content/plugins/wp-cerber/includes/db-warp/CRB_Schema_Manager.php(904): CRB_Schema_Manager->table_exists()
#3 /home/XXXX/public_html/wp-content/plugins/wp-cerber/cerber-load.php(6522): CRB_Schema_Manager->ensure_table_schema()
#4 /home/XXXX/public_html/wp-content/plugins/wp-cerber/cerber-load.php(6575): crb_ensure_all_table_schemas()
#5 /home/XXXX/public_html/wp-content/plugins/wp-cerber/cerber-load.php(6410): cerber_create_db()
#6 /home/XXXX/public_html/wp-content/plugins/wp-cerber/cerber-load.php(836): cerber_upgrade_all()
#7 /home/XXXX/public_html/wp-content/plugins/wp-cerber/wp-cerber.php(235): cerber_init()
#8 /home/XXXX/public_html/wp-content/mu-plugins/aaa-wp-cerber.php(40): include_once('/home/XXXX...')
#9 /home/XXXX/public_html/wp-settings.php(500): include_once('/home/XXXX...')
#10 /home/XXXX/public_html/wp-config.php(90): require_once('/home/XXXX...')
#11 /home/XXXX/public_html/wp-load.php(50): require_once('/home/XXXX...')
#12 /home/XXXX/public_html/wp-blog-header.php(13): require_once('/home/XXXX...')
#13 /home/XXXX/public_html/index.php(17): require('/home/XXXX...')
#14 {main}
thrown in /home/XXXX/public_html/wp-content/plugins/wp-cerber/includes/db-warp/CRB_Database.php on line 321

So basically auto updated to 9.8.3 broke the site, but I was on old PHP 7.4 – so updated to 8.0 and still getting errors, tried 8.1 and same thing

Any ideas? as I said I have 9.8.3 working on same server on other sites so I am at a loss on what this is all about!

thank you
Sarah

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