Exception in rendering!

Message: Cannot read property 'index' of null

TypeError: Cannot read property 'index' of null
    at <anonymous>:36:917725
    at Array.map (<anonymous>)
    at t.value (<anonymous>:36:917619)
    at t.value (<anonymous>:36:918782)
    at t.value (<anonymous>:36:922076)
    at n (<anonymous>:36:322514)
    at Y (<anonymous>:36:322777)
    at e.render (<anonymous>:36:324349)
    at e.read (<anonymous>:36:324085)
    at Object.renderToString (<anonymous>:36:328379)