diff --git a/lib/adapters/http.js b/lib/adapters/http.js
index 4d5856f8..f8f331df 100644
--- a/lib/adapters/http.js
+++ b/lib/adapters/http.js
@@ -15,7 +15,9 @@ WebService.prototype.define = function defineModel(descr) {
 };
 
 WebService.prototype.getResourceUrl = function getResourceUrl(model) {
-    return this._models[model].settings.restPath;
+    var url = this._models[model].settings.restPath;
+    if (!url) throw new Error('Resource url (restPath) for ' + model + ' is not defined');
+    return url;
 };
 
 WebService.prototype.getBlankReq = function () {