--- select_or_other.module.6.x-2.6	2011-03-25 15:33:18.000000000 +0100
+++ select_or_other.module	2011-03-25 15:33:25.000000000 +0100
@@ -633,7 +633,7 @@ function theme_select_or_other_none($fie
  */
 function select_or_other_content_allowed_values_alter(&$allowed_values, $field) {
   // Test the operation to avoid validation error with text field valudation on saving
-  if ($field['widget']['module'] == 'select_or_other' && $_POST['op'] != t('Save')) {
+  if ($field['widget']['module'] == 'select_or_other' && $_POST['op'] != t('Save') && $_POST['op'] != t('Delete')) {
     $list = explode("\n", $field['widget']['available_options']);
     $list = array_map('trim', $list);
     $list = array_filter($list, 'strlen');