MC-34142: Data Migration Tool: integrity constraint violation exception during migration

Author: victor-v-rad

Diff for: src/Migration/Step/Eav/Data.php

@@ -488,6 +488,9 @@ private function migrateCustomEntityAttributes()
             new \Zend_Db_Expr(sprintf('attribute_id IN (%s)', implode(',', $customAttributeIds)))
         );
         foreach ($customEntityAttributes as $record) {
+            if (!isset($this->mapAttributeGroupIdsSourceDest[$record['attribute_group_id']])) {
+                continue;
+            }
             $record['sort_order'] = $this->getCustomAttributeSortOrder($record);
             $record['attribute_group_id'] = $this->mapAttributeGroupIdsSourceDest[$record['attribute_group_id']];
             $record['entity_attribute_id'] = null;