title: Can not write to a list that contains map
body: <p>I want to mix a list that contains maps like this:</p>
  <pre><code>initTask() async {
  
     List tasks = await ourDb.rawQuery(&quot;SELECT * FROM level1&quot;);
     Random random = Random();
     tasks.shuffle(random);
  
  }
  </code></pre>
  <p>and then I got this error:</p>
  <pre><code>E/flutter (15953): [ERROR:flutter/shell/common/shell.cc(184)] Dart Error: Unhandled exception:
  E/flutter (15953): Unsupported operation: read-only
  </code></pre>
  <p>can anyone help?<br></p>