ReduxForm error when changing value of a radioButton - redux-form

Question

Im using reduxform to generate a survey which includes some radiobutton questions. The problem is that whenever I change the value of the radio button I get this error:
Uncaught Error: Must access array elements with a number, not "undefined".
at deleteInWithPath (deleteIn.js:21)
at deleteInWithPath (deleteIn.js:35)
at deleteIn (deleteIn.js:61)
at createReducer.js:233
at reducer (createReducer.js:548)
at createReducer.js:566
at combination (combineReducers.js:120)
at autoRehydrate.js:30
at computeNextEntry (<anonymous>:2:27469)
at recomputeStates (<anonymous>:2:27769)
I don't know what is causing the error so any helped to spot it would be appreciated.
This is the component that render the radio buttons.
export const QuestionYesNo=({question,valueQuestion,metaData})=>{
let error=null;
if(metaData!==undefined){
if(metaData[question.id]!==undefined){
if((valueQuestion(question.id)===undefined ||valueQuestion(question.id)==='') && metaData[question.id].touched===true){
error=<h4 style={{color:'red'}}>¡Required!</h4>
}
}
}
return(
<div>
<div className="question">
<div><h3>{question.ordinal+"- "+question.name}</h3></div>
<div>
<label>
<Field
name={""+question.id}
component="input"
type="radio"
value="YES"
/>{' '}
Si
</label>
<label>
<Field
name={""+question.id}
component="input"
type="radio"
value="NO"
/>{' '}
No
</label>
</div>
</div>
{error}
</div>
);
};
The above component is inside another component in a loop for each question. The component that contains the above component is the one that has the reduxForm.

Answer 1

This is a bug/limitation of redux-form. Prefix your field names with a letter or with a letter followed by a period if you want your form values to be in an array when passed to onSubmit.
So rather than
name={""+question.id}
do
name={"question"+question.id} // results in {question0: "foo", question1: "bar"}
or (if your ids are monotonically increasing integers starting from zero):
name={"questions."+question.id} // results in array {questions: ["foo", "bar"]}
More info: https://github.com/erikras/redux-form/issues/3753#issuecomment-406435226