Exception in rendering!

Message: (0 , _isomorphicFetch2.default) is not a function

TypeError: (0 , _isomorphicFetch2.default) is not a function
    at sendData (<anonymous>:10844:40)
    at sendGet (<anonymous>:10891:10)
    at <anonymous>:156159:30
    at Object.dispatch (<anonymous>:97904:18)
    at SiteDocument.fetchIfNotPresent (<anonymous>:79435:15)
    at SiteDocument.componentWillMount (<anonymous>:79416:12)
    at ReactCompositeComponentWrapper.performInitialMount (<anonymous>:89474:14)
    at ReactCompositeComponentWrapper.mountComponent (<anonymous>:89381:21)
    at Object.mountComponent (<anonymous>:18359:35)
    at ReactCompositeComponentWrapper.performInitialMount (<anonymous>:89494:34)