diff --git a/src/infrastructure/customfield/editor/PhabricatorCustomFieldEditField.php b/src/infrastructure/customfield/editor/PhabricatorCustomFieldEditField.php
--- a/src/infrastructure/customfield/editor/PhabricatorCustomFieldEditField.php
+++ b/src/infrastructure/customfield/editor/PhabricatorCustomFieldEditField.php
@@ -67,7 +67,9 @@
     $clone = clone $field;
 
     $value = $this->getValue();
-    $clone->setValueFromApplicationTransactions($value);
+    if ($value !== null) {
+      $clone->setValueFromApplicationTransactions($value);
+    }
 
     return $clone->renderEditControl(array());
   }