diff --git a/spec/editor-component-spec.coffee b/spec/editor-component-spec.coffee
index 6b988f818..de7439917 100644
--- a/spec/editor-component-spec.coffee
+++ b/spec/editor-component-spec.coffee
@@ -19,7 +19,7 @@ describe "EditorComponent", ->
       spyOn(window, "clearInterval").andCallFake window.fakeClearInterval
 
       delayAnimationFrames = false
-      nextAnimationFrame = null
+      nextAnimationFrame = -> throw new Error('No animation frame requested')
       spyOn(window, 'requestAnimationFrame').andCallFake (fn) ->
         if delayAnimationFrames
           nextAnimationFrame = fn