React table filter type error (.toLowerCase)

<CommandItem
                    key={option.label}
                    onSelect={() => {
                      if (isSelected) {
                        selectedValues.delete(option.label);
                      } else {
                        selectedValues.add(option.label);
                      }

                      const filterValues = Array.from(selectedValues);

                      column?.setFilterValue(
                        filterValues.length ? filterValues : undefined
                      );
                    }}
                  >