diff --git a/chrome/content/zotero/xpcom/translation/translate.js b/chrome/content/zotero/xpcom/translation/translate.js
index 54edc41a79..1cc1df643b 100644
--- a/chrome/content/zotero/xpcom/translation/translate.js
+++ b/chrome/content/zotero/xpcom/translation/translate.js
@@ -2307,7 +2307,7 @@ Zotero.Translate.IO = {
 			throw "DOMParser error: loading data into data store failed";
 		}
 		
-		nodes.normalize();
+		if("normalize" in nodes) nodes.normalize();
 		
 		return nodes;
 	},