fix: ref.current is not checked to be set (#1550)

* fix: ref.current is not checked to be set

* Update packages/@react-aria/selection/src/useSelectableList.ts

fix: check ref for nullish too

Co-authored-by: Daniel Lu <[email protected]>

Co-authored-by: Daniel Lu <[email protected]>

Author: AndyOGo

packages/@react-aria/selection/src/useSelectableList.ts

@@ -107,7 +107,7 @@ export function useSelectableList(props: SelectableListOptions): SelectableListA
   // If not virtualized, scroll the focused element into view when the focusedKey changes.
   // When virtualized, Virtualizer handles this internally.
   useEffect(() => {
-    if (!isVirtualized && selectionManager.focusedKey) {
+    if (!isVirtualized && selectionManager.focusedKey && ref?.current) {
       let element = ref.current.querySelector(`[data-key="${selectionManager.focusedKey}"]`) as HTMLElement;
       if (element) {
         scrollIntoView(ref.current, element);