Javascript exception: Cannot read property 'gc' of undefined

[MaxGabriel]

Hi, when running the EKG server without GC metrics I'm getting the following exception:

monitor.js:337 Uncaught TypeError: Cannot read property 'gc' of undefined

Here's the stacktrace:

monitor.js:337 Uncaught TypeError: Cannot read property 'gc' of undefined
current_bytes_used @ monitor.js:337
onDataReceived @ monitor.js:159
onDataReceived @ monitor.js:118
e.resolveWith @ jquery-1.6.4.min.js:2
w @ jquery-1.6.4.min.js:4
d @ jquery-1.6.4.min.js:4

Here's a minimal reproduction:

{-# LANGUAGE OverloadedStrings #-}

import qualified System.Remote.Monitoring as EKG
import qualified System.Metrics as EKG

import Control.Concurrent
import Control.Monad


main :: IO ()
main = do
  store <- EKG.newStore
  -- EKG.registerGcMetrics store -- Uncomment to prevent JS exception
  aCounter <- EKG.createCounter "myapp.home_requests" store
  _ <- EKG.forkServerWith store "localhost" 8000
  forever $ do
    putStrLn "Running..."
    threadDelay 10000000