Exception in rendering!

Message: Cannot read property 'children' of undefined

TypeError: Cannot read property 'children' of undefined
    at o (<eval>:37:453983)
    at H (<eval>:37:746625)
    at a (<eval>:37:2849532)
    at <eval>:37:2850550
    at e.t.render (<eval>:37:2850583)
    at e.t.read (<eval>:37:2848454)
    at t.renderToString (<eval>:37:2855301)
    at a.Z.register.App (<eval>:37:1687051)
    at t.default (<eval>:37:3049457)
    at t.default (<eval>:37:3051844)