WordPress database error: cache_key cannot be null

After upgrading from PHP 7.4 to PHP 8.4 I get this error:

WordPress database error Column 'cache_key' cannot be null for query INSERT INTO dhdl_ctf_feed_caches (cache_value, last_updated, cache_key, cron_update, feed_id) VALUES ('[\"error\"]', '2025-04-07 15:40:17', NULL, '', 'legacy') made by require('wp-blog-header.php'), require_once('wp-includes/template-loader.php'), include('/themes/dhdl/single-gruender.php'), do_shortcode, preg_replace_callback, do_shortcode_tag, ctf_init, TwitterFeed\CtfFeed->maybeCacheTweets, TwitterFeed\CtfCache->set_transient, TwitterFeed\CtfCache->update_or_insert

I found these 2 topics related to this error:

• https://wordpress.org/support/topic/cache_key-cannot-be-null-for-query-insert-into-wp_ctf_feed_caches/
• https://wordpress.org/support/topic/database-error-in-2-1-1/

Unfortunately the settings do not work anymore (they just load forever), so I cleared the cache using this code:

global $wpdb;
$table_name = $wpdb->prefix . "options";
$wpdb->query( "
    DELETE
    FROM $table_name
    WHERE option_name LIKE ('%\_transient\_ctf\_%')
    " );
$wpdb->query( "
    DELETE
    FROM $table_name
    WHERE option_name LIKE ('%\_transient\_timeout\_ctf\_%')
    " );

global $wpdb;
$table_name = $wpdb->prefix . "options";
$result = $wpdb->query("
    DELETE
    FROM $table_name
    WHERE option_name LIKE ('%ctf\_\!%')
    ");
delete_option( 'ctf_cache_list' );

But the error still persists.
Why is the cache_key rendered NULL? Is there anything I can do against it?

• This topic was modified 11 months, 3 weeks ago by NETPROFIT.