Reef pollyfill version throws "Invalid operand to 'in': Object expected" error in IE11

Getting the following error in IE11 using the polyfill version of Reef.

Unhandled promise rejection TypeError: Invalid operand to 'in': Object expected
   "Unhandled promise rejection"
   {
      [functions]: ,
      __proto__: { },
      description: "Invalid operand to 'in': Object expected",
      message: "Invalid operand to 'in': Object expected",
      name: "TypeError",
      number: -2146823281,
      stack: "TypeError: Invalid operand to 'in': Object expected
   at stringToHTML (eval code:755:5)
   at Reef.prototype.render (eval code:814:3)
   at Anonymous function (eval code:738:28)
   at Anonymous function (eval code:32:7)
   at forEach (eval code:16:3)
   at renderPolyps (eval code:736:3)
   at Reef.prototype.render (eval code:818:3)
   at displayData (eval code:174:3)
   at _callee$ (eval code:63:13)
   at tryCatch (eval code:43:7)"
   }

For me at least, the str argument being passed into stringToHTML is empty.

[cferdinandi]

@aalfiann Thanks for that test case! Just pushed version 7.6.2, which should address this bug.

[aalfiann]

@cferdinandi

I found the another problem causes invalid operand to ‘in’

The reduced case test >> https://jsfiddle.net/aalfiann/3sq65ebL/

Actual problem is we can’t return empty string in IE11.

Or maybe I miss something?

Example case :

if (props.component.length > 0) {
  return props.component.length; // this work
} else {
  // return ''; // this won't work in IE11
  // return ""; // this won't work in IE11
  retun '<div></div>'; THIS WORK
}

Is there another clean or better way?