Exception in rendering!

Message: Cannot read property 'index' of null

TypeError: Cannot read property 'index' of null
    at <anonymous>:36:874075
    at Array.map (<anonymous>)
    at t.value (<anonymous>:36:873969)
    at t.value (<anonymous>:36:875132)
    at t.value (<anonymous>:36:878382)
    at n (<anonymous>:36:402259)
    at G (<anonymous>:36:402522)
    at e.render (<anonymous>:36:404094)
    at e.read (<anonymous>:36:403830)
    at Object.renderToString (<anonymous>:36:408124)