diff --git a/include/class.forms.php b/include/class.forms.php
index 1fc40ffebe3102b450535c58556ce6a7b1f8db3d..4c0da0524f61e02e262b63971877a54adb353832 100644
--- a/include/class.forms.php
+++ b/include/class.forms.php
@@ -1841,7 +1841,7 @@ 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));
         }