     test.equal runs, [0, 1, 2]
 
   finally
-    computation.stop()
+    computation?.stop()
 
 # To test if afterFlush callbacks are run in the same order on the client and server.
 Tinytest.add "tracker - invalidations inside autorun", (test) ->

      computation.stop()

Tinytest.add "tracker - local queries", (test) ->
  return

  localCollection = new Mongo.Collection null

  try

Tinytest.add "tracker - reactive variable", (test) ->
  try
    computation = null
