Argument 1 passed to JMS\Serializer\Metadata\Driver\AbstractDoctrineTypeDriver::normalizeFieldType() must be of the type string, null given

[dekamaru]

Version: 3.0

I want serialize Entity with Embeddables and get this error.

Error throwed by type-hint value mismatch $doctrineMetadata->getTypeOfField() returns DoctrineType|string|null, but JMS normalizeFieldType (AbastractDoctrineTypeDriver.php) have protected function normalizeFieldType(string $type): ?string signature and error happens.

It was happened after upgrade from symfony 3 to symfony 4, and all bundles updates.
In SerializerBundle 2.3 version all working good, because there is doc-block usage instead type-hint

I think you need set nullable type-hint in normalizeFieldType function.

[dekamaru]

Wrong repository, close issue