[PDOException] SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry 'spread-Nm\SearchBu ndle\Entity\User-4-GLOBAL' for key 'PRIMARY'

gistfile1.php

<?php
namespace Nm\SearchBundle\Command;

use Symfony\Bundle\FrameworkBundle\Command\ContainerAwareCommand;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;
use Nm\SearchBundle\Entity\GroupNotification;
use Nm\SearchBundle\Entity\UserNotification;
use Nm\SearchBundle\Entity\User;
use Nm\SearchBundle\Entity\Action;

class DataFixtureCommand extends ContainerAwareCommand
{
    protected function configure()
    {
        $this
            ->setName('nm:data:load')
            ->setDescription('create data');
    }

    protected function execute(InputInterface $input, OutputInterface $output)
    {

        $em = $this->getContainer()->get('doctrine')->getManager();
        
        $user = new User();
        $user
            ->setLogin("test")
            ->setEmail("test@no.log")
        ;

        $userNotif = new UserNotification();
        $userNotif
            ->setTitle("user test")
            ->setBody("Yata")
            ->setUserName('Demo user');

        $groupNotif = new GroupNotification();
        $groupNotif
            ->setTitle("user test")
            ->setBody("Yata le group")
            ->setGroupName('Nm Group');

        $user->addNotification($userNotif);
        $user->addNotification($groupNotif);

        $em->persist($user);
        $em->flush(); //must flush before creating any Action
        
        $this->getContainer()->get('highco.timeline.manager')->push(Action::create($user, 'control', 'The world'));
        $this->getContainer()->get('highco.timeline.manager')->push(Action::create($user, 'share', $groupNotif));
        $this->getContainer()->get('highco.timeline.manager')->push(Action::create($user, 'like', $user));


        $output->writeln('<info>Data Created</info>');
    }
}