diff --git a/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-detail.tt b/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-detail.tt
index d91935b8e3..090f4634ab 100644
--- a/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-detail.tt
+++ b/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-detail.tt
@@ -1591,7 +1591,7 @@
                             } else if ( div.attr("class") == "cover-image local-coverimg" ) {
                                 lightbox_descriptions.push(_("Local cover image"));
                             } else {
-                                console.log("Source of the image cannot be guessed.")
+                                lightbox_descriptins.push(_("Cover image source unknown"));
                             }
                         }
                     }