After update to 2.6.1, the site is down

Hi,

After update to v2.6.1, all my sites are down, it shows “There has been a critical error on this website.” on the website. I have to delete object-cache.php file to fix it.

And today, the v2.6.2 didn’t fix this.

The error message in the log:

2025/07/24 10:36:31 [error] 64356#0: *3559674 FastCGI sent in stderr: "PHP message: PHP Fatal error: Uncaught Error: Undefined constant Credis_Client::VERSION in /alidata/www/cnsjw/wp-content/object-cache.php:1082
Stack trace: 0 /alidata/www/cnsjw/wp-content/object-cache.php(542): WP_Object_Cache->connect_using_credis(Array) 1 /alidata/www/cnsjw/wp-content/object-cache.php(256): WP_Object_Cache->__construct(false) 2 /alidata/www/cnsjw/wp-includes/load.php(893): wp_cache_init() 3 /alidata/www/cnsjw/wp-settings.php(147): wp_start_object_cache() 4 /alidata/www/cnsjw/wp-config.php(113): require_once('/alidata/www/cn…') 5 /alidata/www/cnsjw/wp-load.php(50): require_once('/alidata/www/cn…') 6 /alidata/www/cnsjw/wp-admin/admin.php(35): require_once('/alidata/www/cn…') 7 /alidata/www/cnsjw/wp-admin/options-general.php(10): require_once('/alidata/www/cn…') 8 {main}

thrown in /alidata/www/cnsjw/wp-content/object-cache.php on line 1082" while reading response header from upstream, client: 118.31.144.96, server: www.cnsjw.cn, request: "GET /wp-admin/options-general.php?page=redis-cache&settings-updated=1 HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "www.cnsjw.cn", referrer: "https://www.cnsjw.cn/wp-admin/options-general.php?page=redis-cache"