QtCreator crash in Design when codes a Listview delegate

On Design mode, when a ListView is trying to put a delegate, QT Creator crashes.

Steps:

• Create a QML with this code:

import QtQuick 2.4
import QtQuick.Layouts 1.3
ColumnLayout {
    width: 400
    height: 400
    ListView {
        width: parent.width
        Layout.fillHeight: true
        Layout.fillWidth: true
    }
}

• Open it with the Designer.

• Choose to view both, the design and the code.
• On the code, put "delegate: Rectangle {".

• import QtQuick 2.4
  import QtQuick.Layouts 1.3
  ColumnLayout {
      width: 400
      height: 400
      ListView {
          width: parent.width
          Layout.fillHeight: true
          Layout.fillWidth: true
          delegate: Rectangle {
      }
  }
  
  

• When press enter after {, creator crashes.