Exception in rendering!

Message: Cannot read property 'children' of undefined

TypeError: Cannot read property 'children' of undefined
    at o (<eval>:37:540774)
    at ee (<eval>:37:790384)
    at a (<eval>:37:3019271)
    at <eval>:37:3020289
    at e.t.render (<eval>:37:3020322)
    at e.t.read (<eval>:37:3018193)
    at t.renderToString (<eval>:37:3025040)
    at a.Z.register.App (<eval>:37:1734036)
    at t.default (<eval>:37:3221305)
    at t.default (<eval>:37:3223692)