PHP Notice: Undefined index: global__r

PHP Notice: Undefined index: global__r in /wp-content/db.php on line 507
PHP Notice: Trying to access array offset on value of type null in /wp-content/db.php on line 507
PHP Notice: Undefined index: global__r in /wp-content/db.php on line 510
PHP Notice: Undefined index: global__r in /wp-content/db.php on line 519

When defining the get_lag and get_lag_cache functions with the threshold, I get the above error.

`function get_lag_cache($wpdb) {
try {
// Create a new Redis instance
$redis = new Redis();
$redis->connect('127.0.0.1', 6379); // Adjust host and port as needed

$lag_data = $redis->get($wpdb->lag_cache_key);

if ($lag_data === false || !isset($lag_data['timestamp']) || !isset($lag_data['lag'])) {
return false;
}

if ($wpdb->lag_cache_ttl < time() - $lag_data['timestamp']) {
return false;
}

return $lag_data['lag'];
} catch (Exception $e) {
return false;
}
}

function get_lag($wpdb) {
// Query to get the replication lag
$results = $wpdb->get_results("SHOW SLAVE STATUS", ARRAY_A);
if (isset($results[0]['Seconds_Behind_Master'])) {
error_log($results[0]['Seconds_Behind_Master']);
return $results[0]['Seconds_Behind_Master'];
} else {
return false;
}
}`

@dd32 Can you please help with this issue? I am not able to enable a lag monitor because of these warnings.