diff --git a/field_collection.module b/field_collection.module
index 66a4179..12c8f21 100644
--- a/field_collection.module
+++ b/field_collection.module
@@ -883,17 +883,36 @@ function field_collection_field_settings_form($field, $instance) {
  * creation or to save changes to the host entity and its collections at once.
  */
 function field_collection_field_presave($host_entity_type, $host_entity, $field, $instance, $langcode, &$items) {
-  foreach ($items as &$item) {
+  foreach ($items as $key => &$item) {
     // In case the entity has been changed / created, save it and set the id.
     // If the host entity creates a new revision, save new item-revisions as
     // well.
     if (isset($item['entity']) || !empty($host_entity->revision)) {
-
-      if ($entity = field_collection_field_get_entity($item)) {
-
+dpm(field_collection_field_get_entity($item));
+      if ($entity = field_collection_field_get_entity($item)) { 
         if (!empty($entity->is_new)) {
           $entity->setHostEntity($host_entity_type, $host_entity, LANGUAGE_NONE, FALSE);
         }
+        else {
+          if ($host_entity_type == 'node' || $host_entity_type == 'field_collection_item') {
+            // Reset item_id when it's a new translation.
+            if (isset($entity->nid) && !$entity->nid) {
+              $item['entity']->item_id = '';
+            }
+            else {
+              $query = new EntityFieldQuery();
+              $query->fieldCondition($item['entity']->field_name, 'value', $item['entity']->item_id, '=');
+              if (isset($entity->nid)) {
+                $query->entityCondition('entity_id', $entity->nid, '!=');
+              }
+              $result = $query->execute();
+              // Reset item_id if another node with the same instance exists.
+              if (!empty($result)) {
+                $item['entity']->item_id = '';
+              }
+            }
+          }
+        }
 
         // If the host entity is saved as new revision, do the same for the item.
         if (!empty($host_entity->revision)) {
@@ -914,6 +933,13 @@ function field_collection_field_presave($host_entity_type, $host_entity, $field,
         );
       }
     }
+    else {
+      // Prevent collections from being attached to newly translated content
+      // when the field collection widget is set to hidden.
+      if ($host_entity_type == 'node' && isset($entity->translation_source)) {
+        unset($items[$key]);
+      }
+    }
   }
 }