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Debug Assertion Failed trying to call SurfFeatureDetector

I have this function in C++:

vector<KeyPoint> test(Mat img)
{
  int minHessian = 400;
  SurfFeatureDetector detector( minHessian );

  vector<KeyPoint> vKeypoints;
  detector.detect( img, vKeypoints );

  return vKeypoints;
}

When I call this function in my main-method everything works fine.

int main( int, char** argv )
{
    // path to a image-file
    char* input = "image.jpg";

    // read image into Mat img
    Mat img = imread( input, CV_LOAD_IMAGE_GRAYSCALE );

    // call function test
    test(img);

    waitKey(0);
    return 0;
}

But as soon as I'm calling this method twice...

int main( int, char** argv )
{
    // path to a image-file
    char* input = "image.jpg";

    // read image into Mat img
    Mat img = imread( input, CV_LOAD_IMAGE_GRAYSCALE );

    // call function test
    test(img);
    test(img); // <-- !!! second call

    waitKey(0);
    return 0;
}

...I get the following error:

image description

Can anyone tell me where my mistake is and how I could fix this? I need to call this function twice with two different images, but every time I do this I get this error.

I'm using Visual Studio 2012.

I already asked this question on stackoverflow: http://stackoverflow.com/questions/21261709/debug-assertion-failed-expression-pfirstblock-phead-using-opencv-and-c-tr