Crash in QGraphicsScene::drawBackground OpenGL 3.1

Morphine_OD

I'm trying to use OGL 3.1 functions only and shaders are coded on CG. So here's the code:

My drawBackground function:

@void Scene::drawBackground(QPainter *painter, const QRectF &rect)
{
drawLoop();
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
glBindVertexArray(0);
}@

That's how I allocate buffers:

@void Scene::allocModelBuffers(Model3d* model)
{
glGenVertexArrays(1, &model->arrayNumber);
glBindVertexArray(model->arrayNumber);
glGenBuffers(1, &model->bufferNumber);
glBindBuffer(GL_ARRAY_BUFFER, model->bufferNumber);
glBufferData(GL_ARRAY_BUFFER,
model->vertices->size() * 3 * sizeof(double),
&model->vertices->first(),
GL_STATIC_DRAW);

glGenBuffers(1, &model->indexNumber);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, model->indexNumber);
glBufferData(GL_ELEMENT_ARRAY_BUFFER,
             model->indices->size()*sizeof(uint),
             &model->indices->first(),
             GL_STATIC_DRAW);

glVertexAttribPointer((GLuint)0, 3, GL_DOUBLE, GL_FALSE, 0, 0);
glEnableVertexAttribArray(0);

}@

And this is how I draw.
@void Scene::draw(Model3d* model)
{
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
glBindVertexArray(0);
glPointSize(model->size);
glBindVertexArray(model->arrayNumber);

cgGLSetParameter4f(color,
                   model->color[0]/255.0f,
                   model->color[1]/255.0f,
                   model->color[2]/255.0f,
                   model->color[3]/255.0f);

//Here goes the CRASH
glDrawElements(model->mode,
model->indices->size(),
GL_UNSIGNED_INT, (GLvoid*)0);
}@

The weird thing is that the code works when processed in paintGL() or paintEvent() methods in QGLWidget.
The crash occurs on glDrawElements. Any help would be appreciated