Konqueror crashes when dealing with *.html files

Binary package hint: konqueror

Using KDE 3.5.4 with Kubuntu 6.06.

I have a collection of HTML files on a local hard drive which I use Konqueror to preview with. However, randomly, if I close the Konqueror tab or window that has an HTML file open or go back to the local directory and open the HTML file in a different application, Konqueror will crash. This seems to happen randomly; sometimes it'll happen, sometimes it won't.

Here is the gdb output produced from the crash:

Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread -1232054592 (LWP 5432)]
[KCrash handler]
#6 0xffffe410 in __kernel_vsyscall ()
#7 0xb7d5f9a1 in raise () from /lib/tls/i686/cmov/libc.so.6
#8 0xb7d612b9 in abort () from /lib/tls/i686/cmov/libc.so.6
#9 0xb7d58f51 in __assert_fail () from /lib/tls/i686/cmov/libc.so.6
#10 0xb60d6094 in khtml::Cache::clear () at loader.cpp:1376
#11 0xb5f71b62 in ~KHTMLFactory (this=0x84af7f0) at khtml_factory.cpp:98
#12 0xb5f54e12 in KHTMLFactory::deref () at khtml_factory.cpp:139
#13 0xb5f71a6d in ~KHTMLFactory (this=0x845e188) at khtml_factory.cpp:103
#14 0xb79213d2 in ~KLibrary (this=0x86b8cb0) at klibloader.cpp:131
#15 0xb7889a69 in KLibLoader::close_pending (this=0x8207030, wrap=0x0)
    at klibloader.cpp:516
#16 0xb79220e0 in ~KLibLoader (this=0x8207030) at klibloader.cpp:328
#17 0xb783aaaf in KLibLoader::cleanUp () at klibloader.cpp:298
#18 0xb78d22e9 in ~KApplication (this=0xbffd7028) at kapplication.cpp:1617
#19 0xb67b2c8b in kdemain () from /usr/lib/libkdeinit_konqueror.so
#20 0xb7fb54f4 in kdeinitmain () from /usr/lib/kde3/konqueror.so
#21 0x0804e173 in launch (argc=4, _name=0x813f2c4 "konqueror",
    args=0x813f2f6 "/home/nael", cwd=0x813f2f6 "/home/nael", envc=26,
    envs=0x813f691 "", reset_env=true, tty=0x0, avoid_loops=false,
    startup_id_str=0x0) at kinit.cpp:639
#22 0x0804e997 in handle_launcher_request (sock=4) at kinit.cpp:1206
#23 0x0804f085 in handle_requests (waitForPid=0) at kinit.cpp:1397
#24 0x08050213 in main (argc=3, argv=0xbffd7b54, envp=0x0) at kinit.cpp:1863
#25 0xb7d4bea2 in __libc_start_main () from /lib/tls/i686/cmov/libc.so.6
#26 0x0804b891 in _start () at ../sysdeps/i386/elf/start.S:119