Symfony2 Doctrine duplicate primary key - symfony

Question

For one of my entities I can suddenly not add records to a specific table. The insert statement is ok, the problem is in the primary key, and that should be handled entirely by doctrine, I have no code to meddle with that. So I am at a loss as to what is actually happening here...
Is this a known effect of something other, PHP/db versions etc.?
... code for setting values of $extraOpening's properties ...
$em = $this->getDoctrine()->getManager();
$em->persist($extraOpening);
$em->flush($extraOpening);
[2017-09-18 11:05:47] request.CRITICAL: Uncaught PHP Exception Doctrine\DBAL\Exception\UniqueConstraintViolationException: "An exception occurred while executing 'INSERT INTO extra_opening (open, close, arrOrDep, callsign, reason, additional, separateOpening, comment, price, debit_period) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)' with params ["2017-09-08 10:50:00", "2017-09-08 10:50:00", "Ospec.", null, "mw test", null, 1, null, 1034, 117]: SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry '0' for key 'PRIMARY'"
--- UPDATE 2 ---
Adding my entity (the little update I just posted was wrong, so disregard if you had time to read it...).
I moved DB using phpmyadmin export and the same tool for import. Perhaps I did a setting wrong relating to relations or pKeys, but I've done it a hundred times and did nothing out of the defaults...
namespace ExtraOpeningBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
/**
* ExtraOpening
*
* #ORM\Table(name="extra_opening")
* #ORM\Entity(repositoryClass="ExtraOpeningBundle\Repository\ExtraOpeningRepository")
*/
class ExtraOpening
{
/**
* #var int
*
* #ORM\Column(name="id", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* #var \DateTime
*
* #ORM\Column(name="open", type="datetime")
*/
private $open;
/**
* #var \DateTime
*
* #ORM\Column(name="close", type="datetime")
*/
private $close;
/**
* #var string
*
* #ORM\Column(name="arrOrDep", type="string", length=6, nullable=true)
*/
private $arrOrDep;
/**
* #var string
*
* #ORM\Column(name="callsign", type="string", length=30, nullable=true)
*/
private $callsign;
/**
* #var string
*
* #ORM\Column(name="reason", type="string", length=255, nullable=true)
*/
private $reason;
/**
* #var int
*
* #ORM\Column(name="additional", type="integer", nullable=true)
*/
private $additional;
/**
* #var bool
*
* #ORM\Column(name="separateOpening", type="boolean")
*/
private $separateOpening;
/**
* #var string
*
* #ORM\Column(name="comment", type="text", nullable=true)
*/
private $comment;
/**
* #var int
*
* #ORM\Column(name="price", type="integer", nullable=true)
*/
private $price;
/**
* #var object \ExtraOpeningBundle\Entity\DebitPeriod
*
* #ORM\ManyToOne(targetEntity="\ExtraOpeningBundle\Entity\DebitPeriod", inversedBy="extraOpenings")
* #ORM\JoinColumn(name="debit_period", referencedColumnName="id", nullable=false)
*/
protected $debitPeriod;
/**
* Get id
*
* #return int
*/
public function getId()
{
return $this->id;
}
/**
* Set open
*
* #param \DateTime $open
*
* #return ExtraOpening
*/
public function setOpen($open)
{
$this->open = $open;
return $this;
}
/**
* Get open
*
* #return \DateTime
*/
public function getOpen()
{
return $this->open;
}
/**
* Set close
*
* #param \DateTime $close
*
* #return ExtraOpening
*/
public function setClose($close)
{
$this->close = $close;
return $this;
}
/**
* Get close
*
* #return \DateTime
*/
public function getClose()
{
return $this->close;
}
/**
* Set arrOrDep
*
* #param string $arrOrDep
*
* #return ExtraOpening
*/
public function setArrOrDep($arrOrDep)
{
$this->arrOrDep = $arrOrDep;
return $this;
}
/**
* Get arrOrDep
*
* #return string
*/
public function getArrOrDep()
{
return $this->arrOrDep;
}
/**
* Set callsign
*
* #param string $callsign
*
* #return ExtraOpening
*/
public function setCallsign($callsign)
{
$this->callsign = $callsign;
return $this;
}
/**
* Get callsign
*
* #return string
*/
public function getCallsign()
{
return $this->callsign;
}
/**
* Set reason
*
* #param string $reason
*
* #return ExtraOpening
*/
public function setReason($reason)
{
$this->reason = $reason;
return $this;
}
/**
* Get reason
*
* #return string
*/
public function getReason()
{
return $this->reason;
}
/**
* Set additional
*
* #param integer $additional
*
* #return ExtraOpening
*/
public function setAdditional($additional)
{
$this->additional = $additional;
return $this;
}
/**
* Get additional
*
* #return int
*/
public function getAdditional()
{
return $this->additional;
}
/**
* Set separateOpening
*
* #param boolean $separateOpening
*
* #return ExtraOpening
*/
public function setSeparateOpening($separateOpening)
{
$this->separateOpening = $separateOpening;
return $this;
}
/**
* Get separateOpening
*
* #return bool
*/
public function getSeparateOpening()
{
return $this->separateOpening;
}
/**
* Set price
*
* #param integer $price
*
* #return ExtraOpening
*/
public function setPrice($price)
{
$this->price = $price;
return $this;
}
/**
* Get price
*
* #return int
*/
public function getPrice()
{
return $this->price;
}
/**
* Get debitTime
*
* #return string
*/
public function getDebitTime()
{
$open = $this->getOpen();
$close = $this->getClose();
$interval = date_diff($open, $close);
$r = $interval->format('%H:%I');
return $r;
}
/**
* Get debitTimeSeconds
*
* #return int
*/
public function getDebitTimeSeconds()
{
$open = $this->getOpen();
$close = $this->getClose();
$r = $close->format('U') - $open->format('U');
return $r;
}
/**
* Get debitHours
*
* #return decimal
*/
public function getDebitHours()
{
$open = $this->getOpen();
$close = $this->getClose();
$seconds = date_timestamp_get($close) - date_timestamp_get($open);
$hours = $seconds / 3600;
if($this->getSeparateOpening() && $hours < 3) {
$hours = 3;
}
return number_format($hours,2);
}
/**
* Get debitAmount
*
* #return decimal
*/
public function getDebitAmount()
{
$hours = $this->getDebitHours();
$price = $this->getPrice();
$amount = $hours * $price;
//return number_format($amount,2);
return $amount;
}
/**
* Set comment
*
* #param string $comment
*
* #return ExtraOpening
*/
public function setComment($comment)
{
$this->comment = $comment;
return $this;
}
/**
* Get comment
*
* #return string
*/
public function getComment()
{
return $this->comment;
}
/**
* Get acrGroup
*
* #return \HazardlogBundle\Entity\ACRGroup
*/
public function getAcrGroup()
{
return $this->getDebitPeriod()->getACRGroup();
}
/**
* Set debitPeriod
*
* #param \ExtraOpeningBundle\Entity\DebitPeriod $debitPeriod
*
* #return ExtraOpening
*/
public function setDebitPeriod(\ExtraOpeningBundle\Entity\DebitPeriod $debitPeriod)
{
$this->debitPeriod = $debitPeriod;
return $this;
}
/**
* Get debitPeriod
*
* #return \ExtraOpeningBundle\Entity\DebitPeriod
*/
public function getDebitPeriod()
{
return $this->debitPeriod;
}
}

Answer 1

As m-khalid-junaid https://stackoverflow.com/users/853360/m-khalid-junaid pointed out, the import had been corrupt and the auto_increment property had gone unnoticed, it was not set. Thank you.