Error in wp-admin footer when WP_Debug is on

  • When I have WP_DEBUG enabled, the following error is being shown in the footer of the WP Admin:

    Notice: Functie register_rest_route werd verkeerd aangeroepen. In de REST API route definitie voor simplybook/is-authorized ontbreekt het vereiste permission_callback argument. Voor REST API routes die bedoeld zijn openbaar te zijn, gebruik __return_true als de toestemming callback. Lees Foutopsporing in WordPress voor meer informatie. (Dit bericht is toegevoegd in versie 5.5.0.) in /public_html/wp-includes/functions.php on line 6085

    Translation:

    Notice: Function register_rest_route was called incorrectly. The REST API route definition for simplybook/is-authorized is missing the required permission_callback argument. For REST API routes that are intended to be public, use __return_true as the permission callback. Read Error detection in WordPress for more information. (This post was added in version 5.5.0.) in /public_html/wp-includes/functions.php on line 6085

    Not a breaking bug, but just wanted to let you know. Thank you!

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