This is a bug in Crystal which assumes a reparenting WM and does no error 
checking at all.
See here for analysis and explanation: 
http://bugs.opencompositing.org/show_bug.cgi?id=359

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kde-window-decorator crashes with sigsegv if the mouse wheel is rolled over 
titlebar in Crystal deco
https://bugs.launchpad.net/bugs/150652
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