diff --git a/newsletter.module b/newsletter.module
index 1a578f1..0da2304 100644
--- a/newsletter.module
+++ b/newsletter.module
@@ -903,7 +903,7 @@ function newsletter_field_attach_presave($entity_type, $entity) {
       $terms = isset($entity->{'exposed_' . $exposed_list}) ? $entity->{'exposed_' . $exposed_list} : array();
       $tids = array();
       foreach ($terms as $tid => $value) {
-        if (!is_null($value)) {
+        if (!empty($value)) {
           $tids[] = $tid;
         }
       }