Crash of the Aquamarine KDE Decorator

The window notifying of a bug popped-up and advised to submit the bug to ubuntu developers. In the window it was saying something about crashing of the Aquamarine KDE Decorator.
I'm using kubuntu, Fiesty Fawn, 7.04, KDE, Beryl, Aquamarine KDE decorator.
System specs.: Intel Pentium D, DDR2 - 1Gb, Motherboard Intel 945 GNTL.

Here is the technical content of the bug:

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Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
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[Thread debugging using libthread_db enabled]
[New Thread -1226656048 (LWP 5811)]
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[KCrash handler]
#6 0xb769184e in QObject::parent () from /usr/lib/libqt-mt.so.3
#7 0xb769201f in QWidget::parentWidget () from /usr/lib/libqt-mt.so.3
#8 0xb77a58e7 in QWidget::~QWidget () from /usr/lib/libqt-mt.so.3
#9 0xb7806ad7 in QButton::~QButton () from /usr/lib/libqt-mt.so.3
#10 0xb7f547b1 in KCommonDecorationButton::~KCommonDecorationButton ()
   from /usr/lib/libkdecorations.so.1
#11 0xb6be56c5 in KWinPlastik::PlastikButton::~PlastikButton ()
   from /usr/lib/kde3/kwin3_plastik.so
#12 0xb7f573d4 in KCommonDecoration::~KCommonDecoration ()
   from /usr/lib/libkdecorations.so.1
#13 0xb6be89c8 in KWinPlastik::PlastikClient::~PlastikClient ()
   from /usr/lib/kde3/kwin3_plastik.so
#14 0x0805bc3b in ?? ()
#15 0x08170ad8 in ?? ()
#16 0x01e000eb in ?? ()
#17 0x0000022d in ?? ()
#18 0xb76a7194 in QMutexLocker::~QMutexLocker () from /usr/lib/libqt-mt.so.3
#19 0x08055111 in ?? ()
#20 0x081708e8 in ?? ()
#21 0x000000c5 in ?? ()
#22 0x00000000 in ?? ()