Exception in rendering!

Message: Cannot read property 'id' of null

TypeError: Cannot read property 'id' of null
    at <anonymous>:8668:60
    at <anonymous>:8672:16
    at RelatedContentsList.render (<anonymous>:8675:10)
    at ReactCompositeComponentWrapper._renderValidatedComponentWithoutOwnerOrContext (<anonymous>:126893:30)
    at ReactCompositeComponentWrapper._renderValidatedComponent (<anonymous>:126916:32)
    at ReactCompositeComponentWrapper.performInitialMount (<anonymous>:126456:30)
    at ReactCompositeComponentWrapper.mountComponent (<anonymous>:126352:21)
    at Object.mountComponent (<anonymous>:11214:35)
    at ReactDOMComponent.mountChildren (<anonymous>:129865:44)
    at ReactDOMComponent._createContentMarkup (<anonymous>:127771:32)