diff --git a/chrome/content/zotero/xpcom/quickCopy.js b/chrome/content/zotero/xpcom/quickCopy.js
index 9a7f8bc92..2cc6d0cd3 100644
--- a/chrome/content/zotero/xpcom/quickCopy.js
+++ b/chrome/content/zotero/xpcom/quickCopy.js
@@ -115,7 +115,7 @@ Zotero.QuickCopy = new function() {
 		catch (e) {}
 		
 		// Skip non-HTTP URLs
-		if (!/^https?$/.test(nsIURI.scheme)) {
+		if (!nsIURI || !/^https?$/.test(nsIURI.scheme)) {
 			return quickCopyPref;
 		}