Fixed WP_CRON_LOCK_TIMEOUT already outlined in /htdocs/wp-config.php

I received this PHP error :

Discover: Fixed WP_CRON_LOCK_TIMEOUT already outlined in /htdocs/wp-config.php on line 195

I do not perceive as a result of after I do a search within the wordpress venture with the phrase WP_CRON_LOCK_TIMEOUT I received simply this outcome :

How PHP can say WP_CRON_LOCK_TIMEOUT is already outlined if the second code line in default-constants.php is wrapped by a situation like this :

if ( !outlined( 'WP_CRON_LOCK_TIMEOUT' ) )
    outline('WP_CRON_LOCK_TIMEOUT', 60);  // In seconds

Discover : I did a google search and a load of internet sites appeared with this error within the description so it is a frequent error.