Exception in rendering!

Message: Cannot read property 'index' of null

TypeError: Cannot read property 'index' of null
    at <anonymous>:36:1041896
    at Array.map (<anonymous>)
    at n.value (<anonymous>:36:1041789)
    at n.value (<anonymous>:36:1043002)
    at n.value (<anonymous>:36:1046680)
    at a (<anonymous>:36:370872)
    at _e (<anonymous>:36:371149)
    at e.t.render (<anonymous>:36:373673)
    at e.t.read (<anonymous>:36:373246)
    at Object.renderToString (<anonymous>:36:378476)