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?


let propValue = props[propKey];
    if (propValue == null) {
      continue;
    }
    if (propKey === STYLE) {
      propValue = createMarkupForStyles(propValue);
    }
    let markup = null;
    if (isCustomComponent(tagLowercase, props)) {
      if (!RESERVED_PROPS.hasOwnProperty(propKey)) {
        markup = createMarkupForCustomAttribute(propKey, propValue);
      }
    } else {
      markup = createMarkupForProperty(propKey, propValue);
    }
    if (markup) {
      ret += ' ' + markup;
    }
  }
  
  
  if (makeStaticMarkup) {
    return ret;
  }
  if (isRootElement) {
    ret += ' ' + createMarkupForRoot();
  }
  return ret;
}
function validateRenderResult(child, type) {