diff --git a/modules/crossref/biblio.crossref.client.php b/modules/crossref/biblio.crossref.client.php
index 2d582d7..f913847 100644
--- a/modules/crossref/biblio.crossref.client.php
+++ b/modules/crossref/biblio.crossref.client.php
@@ -291,7 +291,8 @@ class BiblioCrossRefClient
           }
           break;
         case 'resource':
-          if ($this->doi_data) {
+          // only allow first url value. see #788384
+          if ($this->doi_data && !isset($this->node['biblio_url'])) {
               $this->_set_data('biblio_url', $data);
           }
           break;
@@ -340,4 +341,4 @@ class BiblioCrossRefClient
     if ($role == 'translator') return 4;
     return NULL;
   }
-}
\ No newline at end of file
+}