Exception in rendering!

Message: xhr.open is not a function

TypeError: xhr.open is not a function
    at Request.end [as execute] (/tmp/nacmartin_phpexecjs58fd1f84934d73.73782168.js:50642:8)
    at Request._end (/tmp/nacmartin_phpexecjs58fd1f84934d73.73782168.js:49323:13)
    at Request.end (/tmp/nacmartin_phpexecjs58fd1f84934d73.73782168.js:49382:17)
    at StatisticsStore.track (/tmp/nacmartin_phpexecjs58fd1f84934d73.73782168.js:86184:86)
    at Brand.track (/tmp/nacmartin_phpexecjs58fd1f84934d73.73782168.js:85736:44)
    at new Brand (/tmp/nacmartin_phpexecjs58fd1f84934d73.73782168.js:85710:20)
    at ReactCompositeComponentMixin.mountComponent (/tmp/nacmartin_phpexecjs58fd1f84934d73.73782168.js:7779:17)
    at Object.ReactReconciler.mountComponent (/tmp/nacmartin_phpexecjs58fd1f84934d73.73782168.js:6164:36)
    at ReactCompositeComponentMixin.mountComponent (/tmp/nacmartin_phpexecjs58fd1f84934d73.73782168.js:7851:35)
    at Object.ReactReconciler.mountComponent (/tmp/nacmartin_phpexecjs58fd1f84934d73.73782168.js:6164:36)