Fluent Form Repeater Field Unique validation

fluentf-form-repeater-validation.php

add_filter('fluentform_validate_input_item_repeater_field', function ($errorMessage, $field, $formData, $fields, $form) {
    
	$name = 'repeater_field'; 
	$data = $formData[$name];
	$col_index = 0;

        $values= array_column($data,$col_index);
	$unique_count = count(array_unique($values));
	$count = count($values);
	
	if($unique_count != $count){
		
		return[  "Error! Duplicate"];
	}

    return $errorMessage;

}, 10, 5);