diff --git a/views/handlers/entity_views_handler_relationship_by_bundle.inc b/views/handlers/entity_views_handler_relationship_by_bundle.inc
index f5457a0..cd297e8 100644
--- a/views/handlers/entity_views_handler_relationship_by_bundle.inc
+++ b/views/handlers/entity_views_handler_relationship_by_bundle.inc
@@ -88,6 +88,7 @@ class entity_views_handler_relationship_by_bundle extends views_handler_relation
     }
 
     // Add an extra clause to the join if there are bundle types selected.
+    $this->options['bundle_types'] = array_filter($this->options['bundle_types']);
     if ($this->options['bundle_types']) {
       $def['extra'] = array(
         array(