diff --git a/src/applications/differential/field/specification/revisionid/DifferentialRevisionIDFieldSpecification.php b/src/applications/differential/field/specification/revisionid/DifferentialRevisionIDFieldSpecification.php
index 21fd05382e..769fe79334 100644
--- a/src/applications/differential/field/specification/revisionid/DifferentialRevisionIDFieldSpecification.php
+++ b/src/applications/differential/field/specification/revisionid/DifferentialRevisionIDFieldSpecification.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * Copyright 2012 Facebook, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -47,6 +47,9 @@ final class DifferentialRevisionIDFieldSpecification
   }
 
   public function renderValueForCommitMessage($is_edit) {
+    if ($is_edit || !$this->id) {
+      return null;
+    }
     return PhabricatorEnv::getProductionURI('/D'.$this->id);
   }