I happened to notice that React will throw `Hooks can only be called inside the body of a function component` if a sibling element calls `ReactDOMServer.renderToStaticMarkup`. I have a [fiddle](https://jsfiddle.net/er4kL3of/) that shows this behavior (I think you need to manually open your console to see the error).

If you wrap the sibling element in a component or even just assign it a variable, this issue does not occur.

It's easy to get around and is a pretty specific bug, but why might this be happening?


child = null;
      }
    }
    validateRenderResult(child, Component);
    let childContext;
    if (typeof inst.getChildContext === 'function') {
      let childContextTypes = Component.childContextTypes;
      if (typeof childContextTypes === 'object') {
        childContext = inst.getChildContext();
        for (let contextKey in childContext) {
          invariant(
            contextKey in childContextTypes,
            '%s.getChildContext(): key "%s" is not defined in childContextTypes.',
            getComponentName(Component) || 'Unknown',
            contextKey,
          );
        }
      } else {
        warningWithoutStack(