diff --git a/chrome/content/zotero/xpcom/utilities.js b/chrome/content/zotero/xpcom/utilities.js
index a966e32aa8..572b6bedd5 100644
--- a/chrome/content/zotero/xpcom/utilities.js
+++ b/chrome/content/zotero/xpcom/utilities.js
@@ -84,6 +84,7 @@ Zotero.Utilities.prototype.cleanAuthor = function(author, type, useComma) {
  */
 Zotero.Utilities.prototype.trim = function(/**String*/ s) {
 	if (typeof(s) != "string") {
+		Zotero.debug(s);
 		throw "trim: argument must be a string";
 	}