title: ReduxForm error when changing value of a radioButton
body: <p>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:</p>
  
  <pre><code>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 (&lt;anonymous&gt;:2:27469)
      at recomputeStates (&lt;anonymous&gt;:2:27769)
  </code></pre>
  
  <p>I don't know what is causing the error so any helped to spot it would be appreciated.</p>
  
  <p>This is the component that render the radio buttons.</p>
  
  <pre><code>export const QuestionYesNo=({question,valueQuestion,metaData})=&gt;{
    let error=null;
  
    if(metaData!==undefined){
      if(metaData[question.id]!==undefined){
        if((valueQuestion(question.id)===undefined ||valueQuestion(question.id)==='') &amp;&amp; metaData[question.id].touched===true){
          error=&lt;h4 style={{color:'red'}}&gt;¡Required!&lt;/h4&gt;
        }
      }
    }
    return(
      &lt;div&gt;
        &lt;div className="question"&gt;
          &lt;div&gt;&lt;h3&gt;{question.ordinal+"- "+question.name}&lt;/h3&gt;&lt;/div&gt;
          &lt;div&gt;
            &lt;label&gt;
              &lt;Field
                name={""+question.id}
                component="input"
                type="radio"
                value="YES"
              /&gt;{' '}
              Si
            &lt;/label&gt;
            &lt;label&gt;
              &lt;Field
                name={""+question.id}
                component="input"
                type="radio"
                value="NO"
              /&gt;{' '}
              No
            &lt;/label&gt;
          &lt;/div&gt;
        &lt;/div&gt;
        {error}
  
      &lt;/div&gt;
  
  
    );
  };
  </code></pre>
  
  <p>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. </p>