Exception in rendering!

Message: Cannot read property 'h1' of undefined

TypeError: Cannot read property 'h1' of undefined
    at n.Oe.value (<eval>:238:143177)
    at o (<eval>:158:11774)
    at _e (<eval>:158:12048)
    at e.t.render (<eval>:158:14564)
    at e.t.read (<eval>:158:14140)
    at Ee.renderToString (<eval>:158:19346)
    at f.a.register.App (<eval>:238:1060957)
    at t.default (<eval>:83:386938)
    at t.default (<eval>:158:25286)
    at Object.v.ReactOnRails.serverRenderReactComponent (<eval>:68:70926)