title: If you want to write it to the DOM, pass a string instead: w="true" or w={value.toString()}
body: <p>I got this error while rendering:</p>
  
  <blockquote>
    <p>Warning: Received 'true' for a non-boolean attribute 'w'.
    If you want to write it to the DOM, pass a string instead: w="true" or w={value.toString()}.</p>
  </blockquote>
  
  <p>When I remove the code below my code the error disappears:</p>
  
  <pre><code>&lt;div className="form-group"&gt;
    &lt;div className="col-12"&gt;
      &lt;label htmlFor="inputConfirmType"&gt;Type de confirmation&lt;/label&gt;
      &lt;select id="inputConfirmType" name="confirmType" className="form-control" onChange={this.handleInputChange} required&gt;
        &lt;option value=""w&gt;Selectionner un type&lt;/option&gt;
        &lt;option value="Ecole"&gt;Ecole&lt;/option&gt;
        &lt;option value="Professeur"&gt;Professeur&lt;/option&gt;
        &lt;option value="Inspecteur"&gt;Inspecteur&lt;/option&gt;
      &lt;/select&gt;
    &lt;/div&gt;
  &lt;/div&gt;
  </code></pre>