diff --git a/.gitignore b/.gitignore
index fe5397c..bc9ef43 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,3 +5,4 @@ dist/
 node_modules
 npm-debug.log
 .DS_Store
+.idea
diff --git a/lib/Resource.js b/lib/Resource.js
index 838f18a..0f06766 100644
--- a/lib/Resource.js
+++ b/lib/Resource.js
@@ -56,11 +56,12 @@ Resource.prototype._getRaw = function() {
 Resource.prototype._getDelta = function() {
   var primaryRelations = { };
   var relationships = this._getRaw().relationships;
-  Object.keys(relationships).forEach(function(i) {
-    if (getMeta(relationships[i]).relation === "foreign") return;
-    primaryRelations[i] = relationships[i];
-  });
-
+  if (typeof relationships != 'undefined') {
+    Object.keys(relationships).forEach(function (i) {
+      if (getMeta(relationships[i]).relation === "foreign") return;
+      primaryRelations[i] = relationships[i];
+    });
+  }
   return {
     id: this._base.id,
     type: this._base.type,