Exception in rendering!

Message: Cannot read property 'h1' of undefined

TypeError: Cannot read property 'h1' of undefined
    at t.M.value (<eval>:209:479046)
    at o (<eval>:143:11706)
    at ke (<eval>:143:11980)
    at e.t.render (<eval>:143:14496)
    at e.t.read (<eval>:143:14072)
    at Ee.renderToString (<eval>:143:19263)
    at f.a.register.App (<eval>:209:1041222)
    at t.default (<eval>:73:385835)
    at t.default (<eval>:143:25233)
    at Object.v.ReactOnRails.serverRenderReactComponent (<eval>:73:2803)