Guard against viewportListeners being undefined

Closes #45
DockYard · Feb 18, 2016 · 9503380 · 9503380
1 parent d86077d
commit 9503380
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/addon/mixins/in-viewport.js b/addon/mixins/in-viewport.js
@@ -28,7 +28,8 @@ export default Mixin.create({
     this._super(...arguments);
     const options = merge({
       viewportUseRAF: canUseRAF(),
-      viewportEntered: false
+      viewportEntered: false,
+      viewportListeners: []
     }, this._buildOptions());
 
     setProperties(this, options);