I'm not really sure who to ask about this, but could we add something in here https://github.com/Day8/re-frame/wiki/Using-Stateful-JS-Components mentioning that props must be a map? I was only stuck 25 mins on this wondering why I kept getting nil cause I serendipitously clicked on this https://www.martinklepsch.org/posts/props-children-and-component-lifecycle-in-reagent.html and found an answer very quickly.