Exception in rendering!

Message: xhr.open is not a function

TypeError: xhr.open is not a function
    at Request.end [as execute] (/tmp/nacmartin_phpexecjs58b32b18e55705.98918323.js:50077:8)
    at Request._end (/tmp/nacmartin_phpexecjs58b32b18e55705.98918323.js:48758:13)
    at Request.end (/tmp/nacmartin_phpexecjs58b32b18e55705.98918323.js:48817:17)
    at StatisticsStore.track (/tmp/nacmartin_phpexecjs58b32b18e55705.98918323.js:85499:86)
    at Brand.track (/tmp/nacmartin_phpexecjs58b32b18e55705.98918323.js:85120:44)
    at new Brand (/tmp/nacmartin_phpexecjs58b32b18e55705.98918323.js:85094:20)
    at ReactCompositeComponentMixin.mountComponent (/tmp/nacmartin_phpexecjs58b32b18e55705.98918323.js:7779:17)
    at Object.ReactReconciler.mountComponent (/tmp/nacmartin_phpexecjs58b32b18e55705.98918323.js:6164:36)
    at ReactCompositeComponentMixin.mountComponent (/tmp/nacmartin_phpexecjs58b32b18e55705.98918323.js:7851:35)
    at Object.ReactReconciler.mountComponent (/tmp/nacmartin_phpexecjs58b32b18e55705.98918323.js:6164:36)