Segmentation Fault when accesing more than once

[KillGabio]

OK i dont know if it is the hour or what but this lines cause the program to finish unexpectedly, only if the process is called more than once. I mean everything goes fine when i click the button for the first time but if I click it again bamm app exits:

QPixmap bg;
    RandomInfo *randurl = new RandomInfo ();
    if (url.contains (QString ("ya_cerramos")))
        bg = QPixmap (url);
    else{
        bg = QPixmap (randurl->getRandomUrl ());
    }
    this->ui->label_imagen->setPixmap (bg);
QStringList frase_autor = QStringList ();
    frase_autor = randurl->getFraseRandom ();

QPixmap bg;
    RandomInfo *randurl = new RandomInfo ();
    if (url.contains (QString ("ya_cerramos")))
        bg = QPixmap (url);
    else{
        bg = QPixmap (randurl->getRandomUrl ());
    }
    this->ui->label_imagen->setPixmap (bg);
QStringList frase_autor = QStringList ();
    frase_autor = randurl->getFraseRandom ();

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PS: this is the code of the method that returns the list, just in case:

QStringList frase_autor;
        frase_autor << query->value (1).toString ().trimmed ()<< query->value (2).toString ().trimmed ();
        return frase_autor;

QStringList frase_autor;
        frase_autor << query->value (1).toString ().trimmed ()<< query->value (2).toString ().trimmed ();
        return frase_autor;

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BTW i dont get any error while executing this, the list is returned...the problem is when I assign the return list to the list of the mainclass...