Exception in rendering!

Message: Cannot read property 'id' of null

TypeError: Cannot read property 'id' of null
    at <anonymous>:8220:60
    at <anonymous>:8224:16
    at RelatedContentsList.render (<anonymous>:8227:10)
    at ReactCompositeComponentWrapper._renderValidatedComponentWithoutOwnerOrContext (<anonymous>:117682:30)
    at ReactCompositeComponentWrapper._renderValidatedComponent (<anonymous>:117705:32)
    at ReactCompositeComponentWrapper.performInitialMount (<anonymous>:117245:30)
    at ReactCompositeComponentWrapper.mountComponent (<anonymous>:117141:21)
    at Object.mountComponent (<anonymous>:10767:35)
    at ReactDOMComponent.mountChildren (<anonymous>:120654:44)
    at ReactDOMComponent._createContentMarkup (<anonymous>:118560:32)