![Jonas Ådahl](/assets/img/avatar_default.png)
If a parent doesn't have a window, it means it could have been dismissed (for example due to a input serial race), but the more recent popup might win the input serial race and try to map anyway. This would result in a crash later on when trying to process the placement rule, as the parent already has no window. https://bugzilla.gnome.org/show_bug.cgi?id=790358
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