Exception in rendering!

Message: Cannot read property 'index' of null

TypeError: Cannot read property 'index' of null
    at <anonymous>:36:810542
    at Array.map (<anonymous>)
    at t.value (<anonymous>:36:810436)
    at t.value (<anonymous>:36:811599)
    at t.value (<anonymous>:36:814893)
    at n (<anonymous>:36:386188)
    at G (<anonymous>:36:386451)
    at e.render (<anonymous>:36:388023)
    at e.read (<anonymous>:36:387759)
    at Object.renderToString (<anonymous>:36:392053)