MenuItemButton error if child is null about flutter HOT 3 OPEN

class MenuItemButton extends StatefulWidget {
  @override
  State<MenuItemButton> createState() => _MenuItemButtonState();
}


class _MenuItemButtonState extends State<MenuItemButton> {
  @override
  Widget build(BuildContext context) {
     Widget child = TextButton(
      onPressed: widget.enabled ? _handleSelect : null,
      onHover: widget.enabled ? _handleHover : null,
      onFocusChange: widget.enabled ? widget.onFocusChange : null,
      focusNode: _focusNode,
      style: mergedStyle,
      statesController: widget.statesController,
      clipBehavior: widget.clipBehavior,
      isSemanticButton: null,
      child: _MenuItemLabel(
        leadingIcon: widget.leadingIcon,
        shortcut: widget.shortcut,
        trailingIcon: widget.trailingIcon,
        hasSubmenu: false,
        child: widget.child!,  <<<<<<<<<<< look here. can't null
      ),
    );
  }
}

  const MenuItemButton({
    super.key,
    this.onPressed,
    this.onHover,
    this.requestFocusOnHover = true,
    this.onFocusChange,
    this.focusNode,
    this.shortcut,
    this.style,
    this.statesController,
    this.clipBehavior = Clip.none,
    this.leadingIcon,
    this.trailingIcon,
    this.closeOnActivate = true,
    required this.child,
  });