diff --git a/ref_field_sync.module b/ref_field_sync.module
index 6e02ddb..918bea8 100644
--- a/ref_field_sync.module
+++ b/ref_field_sync.module
@@ -207,10 +207,14 @@ function ref_field_sync_entity_insert($entity, $type) {
             $new[] = $value['target_id'];
           }
         }
-        foreach ($new as $target_id) {
-          $entities = entity_load($field['settings']['target_type'], array($target_id));
-          // Add reference to synced field.
-          ref_field_sync_add_reference($field['settings']['target_type'], $entities[$target_id], $entity->{$info['entity keys']['id']}, $field['settings']['sync']);
+        if(!empty($new)) {
+          $entities = entity_load($field['settings']['target_type'], $new);
+          if(!empty($entities)) {
+            foreach($entities as $entity_id => $e) {
+              // Add reference to synced field.
+              ref_field_sync_add_reference($field['settings']['target_type'], $e, $entity->{$info['entity keys']['id']}, $field['settings']['sync']);
+            }
+          }
         }
       }
     }
@@ -266,22 +270,29 @@ function ref_field_sync_entity_update($entity, $type) {
 
         // Get removed values.
         $removed = array_diff($old, $new);
-        if ($removed) {
+        // Get added values.
+        $added = array_diff($new, $old);
+
+        $entity_ids = array_merge($removed, $added);
+        $entities = array();
+        if(!empty($entity_id)) {
+          $entities = entity_load($field['settings']['target_type'], $entity_ids);
+        }
+
+        if (!empty($removed)) {
           foreach ($removed as $target_id) {
-            $entities = entity_load($field['settings']['target_type'], array($target_id));
             // Remove reference from synced field.
             if (isset($entities[$target_id])) {
               ref_field_sync_remove_reference($field['settings']['target_type'], $entities[$target_id], $entity->{$info['entity keys']['id']}, $field['settings']['sync']);
             }
           }
         }
-        // Get added values.
-        $added = array_diff($new, $old);
-        if ($added) {
+        if (!empty($added)) {
           foreach ($added as $target_id) {
-            $entities = entity_load($field['settings']['target_type'], array($target_id));
             // Add reference to synced field.
-            ref_field_sync_add_reference($field['settings']['target_type'], $entities[$target_id], $entity->{$info['entity keys']['id']}, $field['settings']['sync']);
+            if (isset($entities[$target_id])) {
+              ref_field_sync_add_reference($field['settings']['target_type'], $entities[$target_id], $entity->{$info['entity keys']['id']}, $field['settings']['sync']);
+            }
           }
         }
       }
@@ -318,10 +329,14 @@ function ref_field_sync_entity_delete($entity, $type) {
           $delete[] = $item['target_id'];
         }
       }
-      foreach ($delete as $target_id) {
-        $entities = entity_load($field['settings']['target_type'], array($target_id));
-        // Remove reference from synced field.
-        ref_field_sync_remove_reference($field['settings']['target_type'], $entities[$target_id], $entity->{$info['entity keys']['id']}, $field['settings']['sync']);
+      if(!empty($delete)) {
+        $entities = entity_load($field['settings']['target_type'], $delete);
+        if(!empty($entities)) {
+          foreach($entities as $entity_id => $e) {
+            // Remove reference from synced field.
+            ref_field_sync_remove_reference($field['settings']['target_type'], $e, $entity->{$info['entity keys']['id']}, $field['settings']['sync']);
+          }
+        }
       }
     }
   }