Can not complete order with packeta 2.0

When I'm trying to finish the order, it throws me an error:

Error: Call to a member function get() on null in Drupal\commerce_packeta\PacketaApiClient->submitShipment() (line 40 of /data/d/a/dadaef5f-93ca-4f27-8d7d-dbc99bd2a54b/xxxxx/web/modules/contrib/commerce_packeta/src/PacketaApiClient.php).