Exception in rendering!

Message: Cannot read property 'index' of null

TypeError: Cannot read property 'index' of null
    at <anonymous>:36:1128542
    at Array.map (<anonymous>)
    at n.value (<anonymous>:36:1128435)
    at n.value (<anonymous>:36:1129648)
    at n.value (<anonymous>:36:1134754)
    at i (<anonymous>:36:683651)
    at _e (<anonymous>:36:683928)
    at e.t.render (<anonymous>:36:686452)
    at e.t.read (<anonymous>:36:686025)
    at Object.renderToString (<anonymous>:36:691255)