Advanced Custom Fields Row Delete Alert

alert-delete.php

// Fix for the field delete

add_action('acf/input/admin_head', 'my_acf_admin_head');

function my_acf_admin_head() {

	?>
	<script type="text/javascript">
	(function($) {

		acf.add_action('ready', function(){

			$('body').on('click', '.-minus.small', function( e ){

				return confirm("Do you really want to delete this?");

			});

		});

	})(jQuery);
	</script>

	<?php

}