diff --git a/guix-data-service/web/view/html.scm b/guix-data-service/web/view/html.scm
index 61b75f1..dd3c07f 100644
--- a/guix-data-service/web/view/html.scm
+++ b/guix-data-service/web/view/html.scm
@@ -723,7 +723,7 @@
                                     (or hash-algorithm ""))
                     "\""
                     ","
-                    "\"" ,hash "\""
+                    "\"" ,(or hash "") "\""
                     ")"
                     ,@(if (eq? count-down 0)
                           '()