Bug in the acf/core/controllers/field_group.php Line 573
In the field group > Locations section of ACF. If I chose a condition to negate (not equal to) Attachments, it doesn’t exist… This is important for someone who has a lot of CPTs and do not want to list each conditions of equal to..
In my installation I’ve removed “attachment” from the 3rd parameter:
for example. Changed: