fix: bulk import external userid error translation (#1144)

* fix: fixes null pointer exception in case of missing externalUserId in bulkImport

* chore: add changelog

Author: tamassoltesz

CHANGELOG.md

@@ -11,6 +11,7 @@ to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 - Fixes bulk migration user roles association when there is no external userId assigned to the user
 - Bulk migration now actually uses the `isVerified` field's value in the loginMethod input
+- Fixes nullpointer exception in bulk migration error handling in case of null external user id
 
 ## [10.1.3]
 

src/main/java/io/supertokens/cronjobs/bulkimport/ProcessBulkUsersImportWorker.java

@@ -215,7 +215,7 @@ private static void handleBulkImportException(List<BulkImportUser> usersBatch, B
         Map<String, Exception> userIndexToError = exception.exceptionByUserId;
         for(String userid : userIndexToError.keySet()){
             Optional<BulkImportUser> userWithId = usersBatch.stream()
-                    .filter(bulkImportUser -> bulkImportUser.id.equals(userid) || bulkImportUser.externalUserId.equals(userid)).findFirst();
+                    .filter(bulkImportUser -> userid.equals(bulkImportUser.id) || userid.equals(bulkImportUser.externalUserId)).findFirst();
             String id = null;
             if(userWithId.isPresent()){
                 id =  userWithId.get().id;