I just checked wp-config to see if debug was ON. Interestingly Debug was not defined at all.
I added:
define( ‘WP_DEBUG’, true );
define( ‘WP_DEBUG_DISPLAY’, false );
define( ‘WP_DEBUG_LOG’, true );
and then after going through the steps in the admin to use ACF I looked in the error logs and there is nothing related to ACF in there.