diff --git a/frontend/main.js b/frontend/main.js
index df8f3bd..9de30c6 100644
--- a/frontend/main.js
+++ b/frontend/main.js
@@ -12,6 +12,10 @@ class TPDF {
             /* Take up json */
             var results = JSON.parse(TPDF.xhr.responseText);
 
+            var pLastUpdate = document.createElement('p');
+            pLastUpdate.appendChild(document.createTextNode('Last database update: ' + new Date(results['lastupdate'] * 1000)));
+            TPDF.output.appendChild(pLastUpdate);
+
             for (var i in results['books']) {
                 var dtAuthors = document.createElement('dt');
                 dtAuthors.appendChild(document.createTextNode('Authors'));
@@ -37,11 +41,11 @@ class TPDF {
                 var ddPublisher = document.createElement('dd');
                 ddPublisher.appendChild(document.createTextNode(results['books'][i]['publisher']));
                 var ddYear = document.createElement('dd');
-                ddYear.appendChild(document.createTextNode(results['books'][i]['year']));
+                if (results['books'][i]['year'] != undefined) ddYear.appendChild(document.createTextNode(results['books'][i]['year']));
                 var ddPages = document.createElement('dd');
-                ddPages.appendChild(document.createTextNode(results['books'][i]['page']));
+                if (results['books'][i]['page'] != undefined) ddPages.appendChild(document.createTextNode(results['books'][i]['page']));
                 var ddISBN = document.createElement('dd');
-                ddISBN.appendChild(document.createTextNode(results['books'][i]['isbn']));
+                if (results['books'][i]['isbn'] != undefined) ddISBN.appendChild(document.createTextNode(results['books'][i]['isbn']));
                 var ddId = document.createElement('dd');
                 ddId.appendChild(document.createTextNode(results['books'][i]['id']));