Issue #3270683: An error happen when the remote entity has been deleted

src/ExternalEntityStorage.php

@@ -310,6 +310,9 @@ class ExternalEntityStorage extends ContentEntityStorageBase implements External
 
     $values = [];
     foreach ($data as $id => $raw_data) {
+      if (empty($raw_data)) {
+        continue;
+      }
       $entity_values = $this->getFieldMapper()->extractEntityValuesFromRawData($raw_data);
       if (!empty($entity_values)) {
         $values[$id] = $entity_values;
@@ -318,6 +321,9 @@ class ExternalEntityStorage extends ContentEntityStorageBase implements External
 
     $entities = [];
     foreach ($values as $id => $entity_values) {
+      if (empty($data[$id])) {
+        continue;
+      }
       // Allow other modules to perform custom mapping logic.
       $event = new ExternalEntityMapRawDataEvent($data[$id], $entity_values);
       $this->eventDispatcher->dispatch(ExternalEntitiesEvents::MAP_RAW_DATA, $event);

[Peter Droogmans]

This is just hiding the error message, so it will render an empty entity/page.

It should throw an exception so it can be handled better.