I am not sure how to reproduce your issue. Can you show the functional test that is triggering this?

Can you please also investigate what exactly gets passed to UniqueEntityValidator::validate() for the $entity argument in your case?

Hello,
The error is trigger when calling $client->request() :

$client->request(
            'PUT',
            $this->getUrl('api_put_article', ['id' => 1]),
            [],
            [],
            ['CONTENT_TYPE' => 'application/json'],
            json_encode([]) // Empty array submitted
        );

The parameter $entity is the expected entity (the Article object).
Both properties exist : supplier and reference. supplier is unchanged compared to the fixture, reference is set to null as no data is provided.

I am sorry, but I still cannot reproduce your issue. Did you try the latest patch releases (line 137 that you mentioned in the issue description isn't the same in more recent releases)? If you still experience the issue then, can you please create a small example project that allows to reproduce your issue?

Same issue here, Symfony 2.8.17

I get this issue when I do not submit the field in my fields-array of my unique entity annotation. So when its disabled in the form because its not needed in a case.

Well, it would still be nice to have a small project that would allow to reproduce the issue.

Hi !

Sorry for the delay, day off and week-end... :-)

Here is a code reproducing the error : https://github.com/flohw/form_errors/
Parameters for mysql connexion are already defined in parameters.yml.dist.

docker-compose build
docker-compose up -d
docker-compose exec php app/console doctrine:schema:create

On / submit the form with 'test' as value. It works. Re submit with 'test' as value then it fails.

Symfony version : 2.7.18 (installed with symfony installer, same as my original project).
I tried then to update with composer (version set to 2.8.* in composer.json) but composer says "Nothing to install or update".

Hi ! Is there some updates here ?

@flohw Sorry for not replying earlier. I have tried your project and the issue indeed is that you are using Symfony 2.8.17. Updating to 2.8.18 (and thus getting the changes from #21562 resolves it). I am closing here as the issue is already fixed.

By the way, the fact that you were not able to update to 2.8.18 is related to the fact that your PHPUnit requirement is bound to 4.1.*.

Ok, I'll try to update phpunit too. Thanks for the hint ! :-)