Exception in rendering!

Message: Cannot read property 'username' of null

TypeError: Cannot read property 'username' of null
    at <eval>:173:91574
    at Array.map (native)
    at b (<eval>:173:91513)
    at t.Q.value (<eval>:47:25108)
    at t.Q.value (<eval>:47:26735)
    at n (<eval>:110:7984)
    at Q (<eval>:110:8244)
    at e.render (<eval>:110:9814)
    at e.read (<eval>:110:9552)
    at Object.Y.renderToString (<eval>:110:13825)