Comment # 10 on bug 1164633 from Wolfgang Bauer

(In reply to Thomas Moldt from comment #9)
> This is very odd. Ksystemlog crashes for me when clicking the X button in
> the title bar, regardless of the number of open tabs in the application.
But it is the same crash (i.e. same backtrace), I suppose?

>From what I can see in the backtrace, it apparently tries to access widgets
that no longer exist, likely because the window is already closed at that point
(that likely also explains why it doesn't crash when you quit it via the menu
or keyboard shortcut, the window is probably closed later then).

As this apparently is a timing issue, the exact behavior may be different on
different systems, maybe the existance of several tabs just makes the crash
more reliable... (just a guess though)