diff --git a/src/applications/differential/customfield/DifferentialDraftField.php b/src/applications/differential/customfield/DifferentialDraftField.php
--- a/src/applications/differential/customfield/DifferentialDraftField.php
+++ b/src/applications/differential/customfield/DifferentialDraftField.php
@@ -24,7 +24,7 @@
     return true;
   }
 
-  public function renderPropertyViewValue() {
+  public function renderPropertyViewValue(array $handles) {
     return null;
   }