Oops, that typo was surviving here since March :p
# Refresh category pages and image description pages
$existing = $this->getExistingCategories();
$categoryInserts = array_diff_assoc( $this->mCategories, $existing );
- $categoryDeletes = array_diff_assoc( $existing, $this->mCategoties );
+ $categoryDeletes = array_diff_assoc( $existing, $this->mCategories );
$categoryUpdates = $categoryInserts + $categoryDeletes;
$existing = $this->getExistingImages();
$imageUpdates = array_diff_key( $existing, $this->mImages ) + array_diff_key( $this->mImages, $existing );