unable activate cache

Hello all

No cache plugins work with my site under development ( w3 total cache, wp super cache, hummingbird …)

With hummingbird the problem start when enable caching option

When I activate and want to visit a page other than the index I have this error :

PHP Fatal error: Call to a member function get() on null in /var/www/wp-includes/cache.php on line 123, referer: https://domain.fr/

It’s this function :

function wp_cache_get( $key, $group = '', $force = false, &$found = null ) {
        global $wp_object_cache;

        return $wp_object_cache->get( $key, $group, $force, $found );
}

WordPress 4.9.8
wp-config.php :

define( 'WP_DEBUG', true );
define( 'WP_CACHE', true );

Related issue : https://ww.wp.xz.cn/support/topic/unable-activate-cache/#post-10988797 ( I was recommended to write here )

Any idea ?

Thanks !
Will

• This topic was modified 7 years, 6 months ago by lawix.