Create a new map and add an element. Doesn't matter what type.
Label is a textarea field, which allows a long label. So do that, add a long label. Try to update the map. And instead, receive an error:

1. Textarea should have a symbol limit. Can make it fancy by adding a symbol counter.
2. API should validate map labels. The error seen in attached image comes from sysmap.php. Posting long label in API directly, the error comes from DB.php when DB insert fails.