[SFML 2.1] Problem z sf::Texture w std::vector

void ImageManager::addImage( std::string fileName )
{
    sf::Texture tmpTexture;
    tmpTexture.loadFromFile( fileName );
    imageArray.push_back( tmpTexture );
}

Game::Game( int screenWidth_, int screenHeight_, std::string title_, bool fulllScreen_ )
{
    this->screenWidth = screenWidth_;
    this->screenHeight = screenHeight_;
   
    if( fulllScreen_ )
         app = new sf::RenderWindow( sf::VideoMode( screenWidth, screenHeight ), title_, sf::Style::Fullscreen );
    else
         app = new sf::RenderWindow( sf::VideoMode( screenWidth, screenHeight ), title_ );
   
    app->setVerticalSyncEnabled( true );
   
    ImageManager::getImageManager().addImage( "Character.png" );
    sprite.setTexture( ImageManager::getImageManager().getImage( 0 ) ); // Test
}

void Game::render()
{
    app->clear();
    app->draw( sprite );
    app->display();
}

ImageManager::~ImageManager()
{
    for( unsigned int i = 0; i < imageArray.size(); i++ )
         delete imageArray[ i ];
   
    imageArray.clear();
}