diff --git a/src/applications/diffusion/controller/DiffusionCommitController.php b/src/applications/diffusion/controller/DiffusionCommitController.php
index b08544f59d..d76553e861 100644
--- a/src/applications/diffusion/controller/DiffusionCommitController.php
+++ b/src/applications/diffusion/controller/DiffusionCommitController.php
@@ -848,6 +848,10 @@ final class DiffusionCommitController extends DiffusionController {
     $refs = explode(',', $refs);
     $refs = array_map('trim', $refs);
 
+    if (!$refs) {
+        return null;
+    }
+
     $ref_links = array();
     foreach ($refs as $ref) {
       $ref_links[] = phutil_render_tag(