Debug assertion in stl algorithms when using QCheckBox::indicator:unchecked in stylesheets

[Qyrychen]

Hi to all! I have same problem to http://qt-project.org/forums/viewthread/36696/

I'm using Qt 5.2.1 and VS 2008. I get an “Expression: sequence not ordered” assertion in “C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\algorithm” line 2262 when add the following style to QCheckBox

QCheckBox::indicator:unchecked {
     image: url(:/images/checkbox_unchecked.png);
 }

P.S. it works good with "checked"

QCheckBox::indicator:checked {
     image: url(:/images/checkbox_unchecked.png);
 }