Possible incorrect variable name

In src\Plugin\Preprocess\Region.php, line 41, shouldn't the if check $region_wells, not $wells?

Current:

static $region_wells;
if (!isset($wells)) {
  $region_wells = $this->theme->getSetting('region_wells');
}

Correct?

static $region_wells;
if (!isset($region_wells)) {
  $region_wells = $this->theme->getSetting('region_wells');
}