Issue #3425539 by jcontreras, abhishek_gupta1, dineshkumarbollu, larowlan:...

Issue #3425539 by jcontreras, abhishek_gupta1, dineshkumarbollu, larowlan: TypeError: _entity_hierarchy_update_field_weight_column(): Argument #1 ($fields) must be of type array

entity_hierarchy.post_update.php

@@ -26,7 +26,10 @@ function entity_hierarchy_post_update_update_weight_column(array &$sandbox): Tra
   $entityType = array_shift($entityTypes);
   $fields = $sandbox['fields'][$entityType];
   unset($sandbox['fields'][$entityType]);
-  _entity_hierarchy_update_field_weight_column($fields, $entityType);
+  // Ensure $fields is an array before proceeding.
+  if (is_array($fields)) {
+    _entity_hierarchy_update_field_weight_column($fields, $entityType);
+  }
 
   $sandbox['#finished'] = empty($sandbox['fields']) ? 1 : ($sandbox['max'] - count($sandbox['fields'])) / $sandbox['max'];
   if ($sandbox['#finished'] !== 1) {