Exception in rendering!

Message: xhr.open is not a function

TypeError: xhr.open is not a function
    at Request.end [as execute] (/tmp/nacmartin_phpexecjs59c972cc9fc562.62760122.js:50658:8)
    at Request._end (/tmp/nacmartin_phpexecjs59c972cc9fc562.62760122.js:49339:13)
    at Request.end (/tmp/nacmartin_phpexecjs59c972cc9fc562.62760122.js:49398:17)
    at StatisticsStore.track (/tmp/nacmartin_phpexecjs59c972cc9fc562.62760122.js:86276:86)
    at Brand.track (/tmp/nacmartin_phpexecjs59c972cc9fc562.62760122.js:85810:44)
    at new Brand (/tmp/nacmartin_phpexecjs59c972cc9fc562.62760122.js:85783:20)
    at ReactCompositeComponentMixin.mountComponent (/tmp/nacmartin_phpexecjs59c972cc9fc562.62760122.js:7779:17)
    at Object.ReactReconciler.mountComponent (/tmp/nacmartin_phpexecjs59c972cc9fc562.62760122.js:6164:36)
    at ReactCompositeComponentMixin.mountComponent (/tmp/nacmartin_phpexecjs59c972cc9fc562.62760122.js:7851:35)
    at Object.ReactReconciler.mountComponent (/tmp/nacmartin_phpexecjs59c972cc9fc562.62760122.js:6164:36)