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Constant WP_CRON_LOCK_TIMEOUT already defined in /htdocs/wp-config.php

I got this PHP error :

Notice: Constant WP_CRON_LOCK_TIMEOUT already defined in /htdocs/wp-config.php on line 195

I don’t understand because when I do a search in the wordpress project with the word WP_CRON_LOCK_TIMEOUT I got just this result :

enter image description here

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

if ( !defined( 'WP_CRON_LOCK_TIMEOUT' ) )
    define('WP_CRON_LOCK_TIMEOUT', 60);  // In seconds

Notice : I did a google search and a load of web sites appeared with this error in the description so it’s a common error.

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Constant WP_CRON_LOCK_TIMEOUT already defined in /htdocs/wp-config.php

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