Exception in rendering!

Message: Cannot read property 'id' of null

TypeError: Cannot read property 'id' of null
    at <anonymous>:8728:60
    at <anonymous>:8732:16
    at RelatedContentsList.render (<anonymous>:8767:10)
    at ReactCompositeComponentWrapper._renderValidatedComponentWithoutOwnerOrContext (<anonymous>:128460:30)
    at ReactCompositeComponentWrapper._renderValidatedComponent (<anonymous>:128483:32)
    at ReactCompositeComponentWrapper.performInitialMount (<anonymous>:128023:30)
    at ReactCompositeComponentWrapper.mountComponent (<anonymous>:127919:21)
    at Object.mountComponent (<anonymous>:11376:35)
    at ReactDOMComponent.mountChildren (<anonymous>:131432:44)
    at ReactDOMComponent._createContentMarkup (<anonymous>:129338:32)