diff --git a/src/infrastructure/customfield/standard/PhabricatorStandardCustomField.php b/src/infrastructure/customfield/standard/PhabricatorStandardCustomField.php
--- a/src/infrastructure/customfield/standard/PhabricatorStandardCustomField.php
+++ b/src/infrastructure/customfield/standard/PhabricatorStandardCustomField.php
@@ -389,7 +389,7 @@
     if (is_array($value)) {
       return empty($value);
     }
-    return !strlen($value);
+    return $value === null || !strlen($value);
   }
 
   public function getApplicationTransactionTitle(