diff --git a/entityreference_prepopulate.module b/entityreference_prepopulate.module
index 8a67fa0..7d26868 100644
--- a/entityreference_prepopulate.module
+++ b/entityreference_prepopulate.module
@@ -80,6 +80,10 @@ function entityreference_prepopulate_field_attach_form($entity_type, $entity, &$
 
   foreach (element_children($form_state['field']) as $field_name) {
     foreach ($form_state['field'][$field_name] as $lang => $value) {
+      if (!isset($value['instance'])) {
+        continue;
+      }
+
       $instance = $value['instance'];
       if (empty($instance['settings']['behaviors']['prepopulate']['status'])) {
         continue;