Exception in rendering!

Message: Cannot read property 'index' of null

TypeError: Cannot read property 'index' of null
    at <anonymous>:36:1056159
    at Array.map (<anonymous>)
    at n.value (<anonymous>:36:1056052)
    at n.value (<anonymous>:36:1057265)
    at n.value (<anonymous>:36:1061413)
    at a (<anonymous>:36:623205)
    at _e (<anonymous>:36:623482)
    at e.t.render (<anonymous>:36:626006)
    at e.t.read (<anonymous>:36:625579)
    at Object.renderToString (<anonymous>:36:630809)