here is the patch you can apply to it, please fix it
diff --git a/piklist/parts/fields/hidden.php b/piklist/parts/fields/hidden.php
index daffa8d..1b8d39a 100644
--- a/piklist/parts/fields/hidden.php
+++ b/piklist/parts/fields/hidden.php
@@ -1,8 +1,8 @@
-<input
+<input
type="hidden"
- id="<?php echo piklist_form::get_field_id($arguments); ?>"
+ id="<?php echo piklist_form::get_field_id($arguments); ?>"
name="<?php echo piklist_form::get_field_name($arguments); ?>"
- value="<?php echo esc_attr($value); ?>"
+ value="<?php echo is_array($value) ? esc_attr(end($value)) : esc_attr($value); ?>"
<?php echo piklist_form::attributes_to_string($attributes); ?>
/>
regards,
Tonny