diff --git a/src/static/js/contentcollector.js b/src/static/js/contentcollector.js
index 245acc0c4..947b3a8d7 100644
--- a/src/static/js/contentcollector.js
+++ b/src/static/js/contentcollector.js
@@ -432,7 +432,7 @@ const makeContentCollector = function (
         let styl = dom.nodeAttr(node, 'style');
         let cls = dom.nodeAttr(node, 'class');
         let isPre = (tname === 'pre');
-        if ((!isPre) && abrowser.safari) {
+        if ((!isPre) && abrowser && abrowser.safari) {
           isPre = (styl && /\bwhite-space:\s*pre\b/i.exec(styl));
         }
         if (isPre) cc.incrementFlag(state, 'preMode');