diff --git a/entityreference.devel_generate.inc b/entityreference.devel_generate.inc
--- a/entityreference.devel_generate.inc
+++ b/entityreference.devel_generate.inc
@@ -19,9 +19,13 @@ function _entityreference_devel_generate($object, $field, $instance, $bundle) {
   // Get all the entity that are referencable here.
   $referencable_entity = entityreference_get_selection_handler($field, $instance)->getReferencableEntities();
   if (is_array($referencable_entity) && !empty($referencable_entity)) {
-    // Get a random key.
-    foreach ($referencable_entity as $type => $eids) {
-      $object_field['target_id'] = array_rand($eids);
+    // $referencable_entity is keyed by bundle type.
+    $random_bundle = array_rand($referencable_entity);
+    if (!empty($random_bundle)) {
+      $target_id = array_rand($referencable_entity[$random_bundle]);
+      if (!empty($referencable_entity[$random_bundle][$target_id])) {
+        $object_field['target_id'] = $target_id;
+      }
     }
   }
   return $object_field;