After upgrading to the 2.x branch, some of my swipers were white-screening the page with this error:
TypeError: Drupal\swiper_formatter\Plugin\views\style\SwiperFormatterStyle::getEntity(): Return value must be of type Drupal\Core\Entity\FieldableEntityInterface, null returned in Drupal\swiper_formatter\Plugin\views\style\SwiperFormatterStyle->getEntity() (line 294 of modules/contrib/swiper_formatter/src/Plugin/views/style/SwiperFormatterStyle.php).
Inspecting the situation with xdebug reveals that SwiperFormatterStyle::getEntity() is not looking in the correct spot for the ECK entity that is present there, and thus returning NULL. SwiperFormatterStyle::getEntity() declares that it will always return a FieldableEntityInterface, so when it returns NULL an error is thrown.
If ECK entities are affected, I'd imagine other entity types might also be.
Attempt to view a swiper formatted view of ECK entities on the 2.x branch, see the error.
Update SwiperFormatterStyle::getEntity() to look more thoroughly through the row for the entity.
MR + review.
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Thanks for reporting and providing an MR for this issue.
We'll review and get back to you if needed.