QFileDialog::getSaveFileName crashes with empty selectedFilter string

On Mac (10.6) QFileDialog::getSaveFileName crashes when empty selectedFilter is passed to the function.

Here is the code that causes the crash:

QString filtersList;
filtersList += "My File Type(*.mft);;";
filtersList += "All Files (.);;";
QString defaultFile( "mypath/new_file.mft");
QString selectedFilter;

selectedFile = QFileDialog::getSaveFileName(
this,
"Save File Dialog",
defaultFile,
filtersList,
&selectedFilter);

The same code works ok on Windows and Linux. In such case selectedFilter returns the filter selected by the user from the file dialog.