diff --git a/chrome/content/zotero/xpcom/storage.js b/chrome/content/zotero/xpcom/storage.js
index 8e38cc6b5a..0bc67397bb 100644
--- a/chrome/content/zotero/xpcom/storage.js
+++ b/chrome/content/zotero/xpcom/storage.js
@@ -79,7 +79,9 @@ Zotero.Sync.Storage = new function () {
 			return;
 		}
 		if (!_session.initFromPrefs()) {
-			_error("Module not initialized");
+			Zotero.debug(_session.name + " module not initialized");
+			_callbacks.onSkip();
+			return;
 		}
 		
 		if (!_session.active) {
@@ -639,10 +641,8 @@ Zotero.Sync.Storage = new function () {
 	
 	
 	this.checkServer = function (module, callback) {
-		_session = new Zotero.Sync.Storage.Session(module, { onError: _error });
-		if (!_session.initFromPrefs()) {
-			_error("Module not initialized");
-		}
+		_session = new Zotero.Sync.Storage.Session(module, { onError: callback });
+		_session.initFromPrefs();
 		_session.checkServer(callback);
 	}
 	
diff --git a/chrome/content/zotero/xpcom/storage/webdav.js b/chrome/content/zotero/xpcom/storage/webdav.js
index 49b32b9e28..1dfcf6fe99 100644
--- a/chrome/content/zotero/xpcom/storage/webdav.js
+++ b/chrome/content/zotero/xpcom/storage/webdav.js
@@ -163,6 +163,9 @@ Zotero.Sync.Storage.Session.WebDAV.prototype.initFromPrefs = function () {
 	}
 	
 	var url = Zotero.Prefs.get('sync.storage.url');
+	if (!url) {
+		return false;
+	}
 	
 	url = scheme + '://' + url;
 	var dir = "zotero";