Minor bug fix.

includes/ingest.form.inc

@@ -625,7 +625,7 @@ function islandora_ingest_form_next_submit(array $form, array &$form_state) {
  */
 function islandora_ingest_form_stash_info(array &$form_state) {
   $storage = &islandora_ingest_form_get_step_storage($form_state);
-  if ($storage) {
+  if ($storage && isset($form_state['values'])) {
     $storage['values'] = $form_state['values'];
     unset($form_state['values']);
   }