gistfile1.txt

diff --git a/src/FieldCollectionItemAccessControlHandler.php b/src/FieldCollectionItemAccessControlHandler.php
index 4c79e3d..41339d8 100644
--- a/src/FieldCollectionItemAccessControlHandler.php
+++ b/src/FieldCollectionItemAccessControlHandler.php
@@ -23,9 +23,13 @@ protected function checkAccess(EntityInterface $entity, $operation, AccountInter
       }
       // Here we will be if host entity was not set and entity is not new.
       elseif (!$entity->isNew()) {
+        // Applications that were migrated throw errors on first save though
+        // the ui. This is a temporary work around for that.
+        /**
         throw new \RuntimeException($this->t('Host entity for field collection item (@id) was not set.', [
           '@id' => $entity->id(),
         ]));
+        */
       }
     }

gistfile2.txt

Bypass error when saving migrated application.