Division by zero in QStyleSheetStyle::drawControl

/Volumes/T3/Dev/qt/qt510_source/qtbase/src/widgets/styles/qstylesheetstyle.cpp:3978:41: runtime error: division by zero
SUMMARY: AddressSanitizer: undefined-behavior /Volumes/T3/Dev/qt/qt510_source/qtbase/src/widgets/styles/qstylesheetstyle.cpp:3978:41 in
/Volumes/T3/Dev/qt/qt510_source/qtbase/src/widgets/styles/qstylesheetstyle.cpp:3978:41: runtime error: value nan is outside the range of representable values of type 'int'
SUMMARY: AddressSanitizer: undefined-behavior /Volumes/T3/Dev/qt/qt510_source/qtbase/src/widgets/styles/qstylesheetstyle.cpp:3978:41 in
/Volumes/T3/Dev/qt/qt510_source/qtbase/src/widgets/styles/qstylesheetstyle.cpp:3978:41: runtime error: division by zero
SUMMARY: AddressSanitizer: undefined-behavior /Volumes/T3/Dev/qt/qt510_source/qtbase/src/widgets/styles/qstylesheetstyle.cpp:3978:41 in

int x = reverse ? r.left() + r.width() - chunkWidth : r.x();

                    for (int i = 0; i < ceil(qreal(fillWidth)/chunkWidth); ++i) {
                        r.setRect(x, rect.y(), chunkWidth, rect.height());
                        r = m.mapRect(QRectF(r)).toRect();
                        subRule.drawRule(p, r);
                        x += reverse ? -chunkWidth : chunkWidth;
                    }