Exception in rendering!

Message: Cannot read property 'h1' of undefined

TypeError: Cannot read property 'h1' of undefined
    at n.xe.value (<eval>:217:381065)
    at o (<eval>:138:11774)
    at _e (<eval>:138:12048)
    at e.t.render (<eval>:138:14564)
    at e.t.read (<eval>:138:14140)
    at Ee.renderToString (<eval>:138:19346)
    at f.a.register.App (<eval>:217:1236193)
    at t.default (<eval>:68:671898)
    at t.default (<eval>:138:25286)
    at Object.v.ReactOnRails.serverRenderReactComponent (<eval>:68:79817)