Exception in rendering!

Message: Cannot read property 'id' of null

TypeError: Cannot read property 'id' of null
    at <anonymous>:8646:60
    at <anonymous>:8650:16
    at RelatedContentsList.render (<anonymous>:8685:10)
    at ReactCompositeComponentWrapper._renderValidatedComponentWithoutOwnerOrContext (<anonymous>:127373:30)
    at ReactCompositeComponentWrapper._renderValidatedComponent (<anonymous>:127396:32)
    at ReactCompositeComponentWrapper.performInitialMount (<anonymous>:126936:30)
    at ReactCompositeComponentWrapper.mountComponent (<anonymous>:126832:21)
    at Object.mountComponent (<anonymous>:11224:35)
    at ReactDOMComponent.mountChildren (<anonymous>:130345:44)
    at ReactDOMComponent._createContentMarkup (<anonymous>:128251:32)