Symfony 3 easyadmin __toString() must not throw an exception - php

Question

I'm using EasyAdmin Bundle. When I'm trying to add a new element in Entity named "Company" which have 'ManyToMany' relation with "Service" entity I'm getting an error:
Error: Method AppBundle\Entity\Service::__toString() must not throw an exception
But when I'm going to add a new element in "Service" entity, everything works fine and the field with "Company" entities is displaying correctly.
I was trying to catch the exception implementing this workaround, but It doesn't take effect.
The Service class:
namespace AppBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
use Doctrine\Common\Collections;
use Doctrine\Common\Collections\ArrayCollection;
/**
* Company
*
* #ORM\Table(name="company")
* #ORM\Entity(repositoryClass="AppBundle\Repository\CompanyRepository")
*/
class Company
{
/**
* #var
*
* Many Companys have Many Services.
* #ORM\ManyToMany(targetEntity="Service", inversedBy="companys")
* #ORM\JoinTable(name="companys_services")
*/
private $services;
public function __construct() {
$this->services = new ArrayCollection();
}
public function __toString()
{
return $this->name;
}
}
And the Service class:
namespace AppBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
use Doctrine\Common\Collections;
use Doctrine\Common\Collections\ArrayCollection;
/**
* Service
*
* #ORM\Table(name="service")
* #ORM\Entity(repositoryClass="AppBundle\Repository\ServiceRepository")
*/
class Service
{
/**
* Many Services have Many Companys.
* #ORM\ManyToMany(targetEntity="Company", mappedBy="services")
*/
private $companys;
public function __construct()
{
$this->companys = new ArrayCollection();
}
public function __toString()
{
return (string) $this->name;
}
}
What is wrong?

Answer 1

The error message is so specific (Service::__toString() must not throw an exception) that the problem must be in the $this->name property of Service. Is it defined? Is a "normal" property or some advanced object which fails when casting it into a string?