message: Fixing mistake again
diff: @@ -116,7 +116,7 @@ export function Droppable<T>(props: DroppableProps<T>) {
  type={accept}
  name={key}
  filterItems={filterOptions}
  - selectedItems={filter.state.get(key)}
  + selectedItems={filter.state.get(key) || new Set<string>()}
  value={keyMapping.get(key) ? keyMapping.get(key).keyName : (key as string)}
  onFilterUpdate={filter.handleUpdate}
  origin={name}
  