diff --git a/include/class.forms.php b/include/class.forms.php
index c80c34ba1567cea62f7cb38150e11b020ca39228..832cd40e742afe096a7f0fd973d5bf3842aad3be 100644
--- a/include/class.forms.php
+++ b/include/class.forms.php
@@ -1835,7 +1835,7 @@ class ChoicesWidget extends Widget {
         }
 
         $values = $this->value;
-        if (!is_array($values) && $values) {
+        if (!is_array($values) && isset($values)) {
             $values = array($values => $this->field->getChoice($values));
         }