This sounds like a duplicate of a bug I can't find right now that was fixed, where clicking the "show desktop" button would crash kicker. Since this is a year old with no more reports, I'm assuming fixedness. Please feel free to reopen if it's not fixed.
** Changed in: kdebase kicker (Ubuntu)
Status: Unconfirmed => Fix Committed
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kicker segfaults
https://launchpad.net/bugs/16528
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