fix(CheckoutGroup): fix CheckoutGroup displayName (#3257)

Co-authored-by: Heising <[email protected]>

src/checkbox/CheckboxGroup.tsx

@@ -54,7 +54,7 @@ const CheckboxGroup = <T extends CheckboxGroupValue = CheckboxGroupValue>(props:
       ? options
       : React.Children.map(
           children,
-          (child: JSX.Element) => child.type.displayName === Checkbox.displayName && (child as ReactElement).props,
+          (child: JSX.Element) => child?.type?.displayName === Checkbox.displayName && (child as ReactElement).props,
         ) || [];
 
   const optionsWithoutCheckAll = intervalOptions.filter((t) => typeof t !== 'object' || !t.checkAll);