Css Hover + Element Crashing In Webkit (chrome, Safari)

Found an annoying bug today which crashed chrome and safari (so all webkit browsers?) with just CSS. It's a hover menu, hovering over an element then displaying the next dropdown l

Solution 1:

Change

.ukn-network-jumperstrong:hover + ul,
.ukn-network-jumperul:hover {
    display:block;
}

to

.ukn-network-jumperstrong:hover + ul,
.ukn-network-jumper:hoverul {
    display:block;
}

You don't want to display the ul when you are hovering the ul but when you are hovering the parent div.