diff --git a/examples/attractorsPlugin.js b/examples/attractorsPlugin.js
index ff1fc08..7ee2497 100644
--- a/examples/attractorsPlugin.js
+++ b/examples/attractorsPlugin.js
@@ -57,6 +57,8 @@
 
     Matter.Plugin.register(MatterAttractors);
 
-    window.MatterAttractors = MatterAttractors;
+    if (typeof window !== 'undefined') {
+        window.MatterAttractors = MatterAttractors;
+    }
 
 })();
diff --git a/examples/gravityPlugin.js b/examples/gravityPlugin.js
index 5ae6315..1b4cf4f 100644
--- a/examples/gravityPlugin.js
+++ b/examples/gravityPlugin.js
@@ -41,6 +41,8 @@
 
     Matter.Plugin.register(MatterGravity);
 
-    window.MatterGravity = MatterGravity;
+    if (typeof window !== 'undefined') {
+        window.MatterGravity = MatterGravity;
+    }
 
 })();
diff --git a/examples/wrapPlugin.js b/examples/wrapPlugin.js
index a00d48f..45779ad 100644
--- a/examples/wrapPlugin.js
+++ b/examples/wrapPlugin.js
@@ -65,6 +65,8 @@
 
     Matter.Plugin.register(MatterWrap);
 
-    window.MatterWrap = MatterWrap;
+    if (typeof window !== 'undefined') {
+        window.MatterWrap = MatterWrap;
+    }
 
 })();
diff --git a/test/node/TestDemo.js b/test/node/TestDemo.js
index 59af310..eb5b308 100644
--- a/test/node/TestDemo.js
+++ b/test/node/TestDemo.js
@@ -162,7 +162,8 @@ var getDemoNames = function() {
         skip = [
             'terrain', 'svg', 'concave', 
             'slingshot', 'views', 'raycasting', 
-            'events', 'collisionFiltering', 'sleeping'
+            'events', 'collisionFiltering', 'sleeping', 
+            'attractors'
         ];
 
     $('#demo-select option', fs.readFileSync('demo/index.html').toString())