--- /var/www/sdabocconi/DrupalSite/sites/all/modules/field_collection/field_collection.module
+++ /var/www/expo-newsletter/sites/all/modules/field_collection/field_collection.module
@@ -973,7 +973,7 @@
 
   // Only if the form is being submitted, finish the collection entity and
   // prepare it for saving.
-  if ($form_state['submitted'] && !form_get_errors()) {
+  if ($form_state['submitted'] && !form_get_errors() && $form_state['clicked_button']['#name'] == 'op') {
 
     field_attach_submit('field_collection_item', $field_collection_item, $element, $form_state);
     // Put the field-collection item in $item['entity'], so it is saved with