I get this error when I logout (http://example.com/logout). I click on a link which takes me to the route named 'logout' and I get this error.

I keep track of all of the IDs used throughout my application (MDBIDs). They are alphanumeric strings of length 16.

I insert the user's MDBID into the mdbids table when the user is created (registered) however, it appears that the store() method is called again or at least something similar as I get this error stating that "Integrity constraint violation: 1062 Duplicate entry"

Any ideas how to fix it?

User.php (model)

<?php

use Illuminate\Auth\UserInterface;
use Illuminate\Auth\Reminders\RemindableInterface;

class User extends Eloquent implements UserInterface, RemindableInterface {
/**
 * @var string
 */
protected $primaryKey = 'mdbid';
/**
 * @var bool
 */
public $incrementing = false;

// Don't forget to fill this array
/**
 * @var array
 */
protected $fillable = array('name', 'dob', 'email', 'username', 'password');

/**
 * The database table used by the model.
 *
 * @var string
 */
protected $table = 'users';

/**
 * The attributes excluded from the model's JSON form.
 *
 * @var array
 */
protected $hidden = array('password');

/**
 * Get the unique identifier for the user.
 *
 * @return mixed
 */
public function getAuthIdentifier()
{
    return $this->getKey();
}

/**
 * Get the password for the user.
 *
 * @return string
 */
public function getAuthPassword()
{
    return $this->password;
}

/**
 * Get the token value for the "remember me" session.
 *
 * @return string
 */
public function getRememberToken()
{
    return $this->remember_token;
}

/**
 * Set the token value for the "remember me" session.
 *
 * @param  string  $value
 * @return void
 */
public function setRememberToken($value)
{
    $this->remember_token = $value;
}

/**
 * Get the column name for the "remember me" token.
 *
 * @return string
 */
public function getRememberTokenName()
{
    return 'remember_token';
}

/**
 * Get the e-mail address where password reminders are sent.
 *
 * @return string
 */
public function getReminderEmail()
{
    return $this->email;
}

public function setPasswordAttribute($password)
{
    $this->attributes['password'] = Hash::make($password);
}

public function save(array $options = array())
{
    $this->mdbid = $this->mdbid ?: str_random(16);
    $this->key  = $this->key  ?: str_random(11);

    // This causes an integrity constraint when I logout
    Mdbid::firstOrCreate([
        'mdbid'        => $this->mdbid,
        'table_number' => 7,
        'table_name'   => 'users',
        'created_at'   => Carbon::now(),
        'updated_at'   => Carbon::now()
    ]);

    parent::save($options);
    //static::saveMdbid($this->mdbid);
}




/**
 * @return \Illuminate\Database\Eloquent\Relations\BelongsToMany
 */
public function tags()
{
    return $this->belongsToMany('Tag', 'tag_track_user', 'user_mdbid', 'tag_mdbid')->withPivot('track_mdbid');
}

/**
 * @return \Illuminate\Database\Eloquent\Relations\BelongsToMany
 */
public function tracks()
{
    return $this->belongsToMany('Track', 'tag_track_user', 'user_mdbid', 'track_mdbid')->withPivot('tag_mdbid');
}

public function profile()
{
    return $this->hasOne('Profile', 'user_mdbid', 'mdbid');
}

}