Exception floating-point division by zero

Exception 0xC000008E: Floating-point division by zero
in file: \src\gui\painting\qrasterizer.cpp
function: QRasterizer::rasterizeLine
lines:
const qreal topLeftSlope = topLeftEdge.x() / topLeftEdge.y();
const qreal bottomLeftSlope = bottomLeftEdge.x() / bottomLeftEdge.y();
const qreal topRightSlope = topRightEdge.x() / topRightEdge.y();
const qreal bottomRightSlope = bottomRightEdge.x() / bottomRightEdge.y();

Exception is only, if flag QPainter::Antialiasing is set for QPainter