diff --git a/ui/src/overridden/frontsite/Document/DocumentDetails/DocumentCirculationExtras.js b/ui/src/overridden/frontsite/Document/DocumentDetails/DocumentCirculationExtras.js
index 3269dc605..964786df4 100644
--- a/ui/src/overridden/frontsite/Document/DocumentDetails/DocumentCirculationExtras.js
+++ b/ui/src/overridden/frontsite/Document/DocumentDetails/DocumentCirculationExtras.js
@@ -2,7 +2,7 @@ import React from "react";
 import _get from "lodash/get";
 import _isEmpty from "lodash/isEmpty";
 import { invenioConfig } from "@inveniosoftware/react-invenio-app-ils";
-import { Embed, Header, Button, Divider } from "semantic-ui-react";
+import { Embed, Button, Divider } from "semantic-ui-react";
 import PropTypes from "prop-types";
 import { shelfLink } from "../../../utils";
 
diff --git a/ui/src/overridden/frontsite/Document/DocumentDetails/DocumentItemBody.js b/ui/src/overridden/frontsite/Document/DocumentDetails/DocumentItemBody.js
index e81c0284b..0e9674ad2 100644
--- a/ui/src/overridden/frontsite/Document/DocumentDetails/DocumentItemBody.js
+++ b/ui/src/overridden/frontsite/Document/DocumentDetails/DocumentItemBody.js
@@ -29,7 +29,7 @@ function renderShelflink(item) {
     : shelfLinkComponent(shelfLink(shelfNumber), shelfNumber);
   return (
     <InfoPopup message={renderCallNumber(item)}>
-      {itemShelf != undefined ? itemShelf : "-"}
+      {itemShelf !== undefined ? itemShelf : "-"}
     </InfoPopup>
   );
 }