diff --git a/sourcing/static/js/xanaflight.js b/sourcing/static/js/xanaflight.js
index 3e984db..2991971 100644
--- a/sourcing/static/js/xanaflight.js
+++ b/sourcing/static/js/xanaflight.js
@@ -234,6 +234,10 @@ function hover_link_bridge(element, hover) {
     var num = get_end_number(element.id);
     var bridge = document.getElementById('linkbridge' + num);
 
+    if (bridge === null) {
+        return;
+    }
+
     bridge.setAttribute("class", hover ? 'hoverlinkbridge' : 'linkbridge');
 
     var cls = 'hoverlink';