diff --git a/wikinote/static/js/page.js b/wikinote/static/js/page.js
index bf634c3..bb688b0 100644
--- a/wikinote/static/js/page.js
+++ b/wikinote/static/js/page.js
@@ -23,7 +23,11 @@ document.querySelectorAll('.tooltip.xref').forEach(function(el) {
 			
 			var xhr = new XMLHttpRequest();
 			xhr.addEventListener('load', function() {
-				el.querySelector('.tooltip-content').innerHTML = xhr.responseText;
+                if (xhr.status == 200) {
+                    el.querySelector('.tooltip-content').innerHTML = xhr.responseText;
+                } else {
+                    el.querySelector('.tooltip-content').innerHTML = 'Error';
+                }
 			})
 			xhr.open('GET', '/preview/' + el.dataset['xref']);
 			xhr.send();