diff --git a/chrome/content/zotero/standalone.js b/chrome/content/zotero/standalone.js
index 8e3ab5ba0..c03e729a2 100644
--- a/chrome/content/zotero/standalone.js
+++ b/chrome/content/zotero/standalone.js
@@ -32,6 +32,7 @@ var ZoteroStandalone = new function()
 		if(!Zotero || !Zotero.initialized) {
 			ZoteroPane.displayStartupError();
 			window.close();
+			return;
 		}
 		ZoteroPane.init();
 		ZoteroPane.makeVisible();