Exception in rendering!

Message: Cannot read property 'index' of null

TypeError: Cannot read property 'index' of null
    at <anonymous>:36:1066037
    at Array.map (<anonymous>)
    at n.value (<anonymous>:36:1065930)
    at n.value (<anonymous>:36:1067143)
    at n.value (<anonymous>:36:1071289)
    at a (<anonymous>:36:637434)
    at _e (<anonymous>:36:637711)
    at e.t.render (<anonymous>:36:640235)
    at e.t.read (<anonymous>:36:639808)
    at Object.renderToString (<anonymous>:36:645038)