Exception in rendering!

Message: Cannot read property 'id' of null

TypeError: Cannot read property 'id' of null
    at <anonymous>:8636:60
    at <anonymous>:8640:16
    at RelatedContentsList.render (<anonymous>:8675:10)
    at ReactCompositeComponentWrapper._renderValidatedComponentWithoutOwnerOrContext (<anonymous>:127107:30)
    at ReactCompositeComponentWrapper._renderValidatedComponent (<anonymous>:127130:32)
    at ReactCompositeComponentWrapper.performInitialMount (<anonymous>:126670:30)
    at ReactCompositeComponentWrapper.mountComponent (<anonymous>:126566:21)
    at Object.mountComponent (<anonymous>:11214:35)
    at ReactDOMComponent.mountChildren (<anonymous>:130079:44)
    at ReactDOMComponent._createContentMarkup (<anonymous>:127985:32)