Same thing on Fedora 23, Konsole crashes on session restore.
It might be due to frameworks 5.16 update.

#5  0x00007f56ad3bf3b0 in Konsole::Session::sessionId() const (this=this@entry=0x0) at ../../src/Session.cpp:872
#6  0x00007f56ad3f6a58 in Konsole::ViewManager::createTerminalDisplay(Konsole::Session*) (this=this@entry=0x5607199bf0c0, session=session@entry=0x0) at ../../src/ViewManager.cpp:752
#7  0x00007f56ad3f9969 in Konsole::ViewManager::createView(Konsole::Session*, Konsole::ViewContainer*, int) (this=this@entry=0x5607199bf0c0, session=session@entry=0x0, container=0x560719b82d40, index=index@entry=-1) at ../../src/ViewManager.cpp:528
#8  0x00007f56ad3f9c90 in Konsole::ViewManager::createView(Konsole::Session*) (this=this@entry=0x5607199bf0c0, session=session@entry=0x0) at ../../src/ViewManager.cpp:588
#9  0x00007f56ad3fd08f in Konsole::ViewManager::restoreSessions(KConfigGroup const&) (this=0x5607199bf0c0, group=...) at ../../src/ViewManager.cpp:945
#10 0x00007f56ab8eb930 in KMainWindow::readPropertiesInternal(KConfig*, int) (this=this@entry=0x5607199753c0, config=0x5607199a6cd0, number=number@entry=1) at ../../src/kmainwindow.cpp:615
#11 0x00007f56ab8eb992 in KMainWindow::restore(int, bool) (this=0x5607199753c0, number=number@entry=1, show=show@entry=true) at ../../src/kmainwindow.cpp:440
#12 0x00007f56ad67ec46 in kdemain(int, char**) (app=...) at ../../src/main.cpp:317
#13 0x00007f56ad67ec46 in kdemain(int, char**) (argc=<optimized out>, argv=<optimized out>) at ../../src/main.cpp:112
#14 0x00007f56a5a25580 in __libc_start_main (main=0x560719437b70 <main(int, char**)>, argc=3, argv=0x7ffe284ccaa8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffe284cca98) at libc-start.c:289
#15 0x0000560719437ba9 in _start ()

The session file (~/.config/sessions/konsole_xxxx) seems to be invalid :
[1]
Active=7
Sessions=1,5,2,3,4,6,7,0
...

If I remove the ",0", the problem is fixed.
When triggering a session save (kickoff -> leave -> save session), the created file is fine, so I don't know how the invalid one was created.

Got this for the first time after logging out and back in to openSUSE 42.1 x86-64 with Plasma 5.5.4 desktop and Konsole 15.12.2 with Qt 5.5.1 (built against 5.5.1 as well) and KDE Frameworks 5.19.0:

Application: Konsole (konsole), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f3cd7e37800 (LWP 16763))]

Thread 2 (Thread 0x7f3cc263d700 (LWP 16765)):
.....

Thread 1 (Thread 0x7f3cd7e37800 (LWP 16763)):
[KCrash Handler]
#6  0x00007f3cd73fd2d0 in Konsole::Session::sessionId() const () at /usr/lib64/libkonsoleprivate.so.15
#7  0x00007f3cd7430ac8 in Konsole::ViewManager::createTerminalDisplay(Konsole::Session*) () at /usr/lib64/libkonsoleprivate.so.15
#8  0x00007f3cd7436565 in Konsole::ViewManager::createView(Konsole::Session*, Konsole::ViewContainer*, int) () at /usr/lib64/libkonsoleprivate.so.15
#9  0x00007f3cd7437800 in Konsole::ViewManager::createView(Konsole::Session*) () at /usr/lib64/libkonsoleprivate.so.15
#10 0x00007f3cd7438a94 in Konsole::ViewManager::restoreSessions(KConfigGroup const&) () at /usr/lib64/libkonsoleprivate.so.15
#11 0x00007f3cd6a6744d in KMainWindow::readPropertiesInternal(KConfig*, int) () at /usr/lib64/libKF5XmlGui.so.5
#12 0x00007f3cd6a675a2 in KMainWindow::restore(int, bool) () at /usr/lib64/libKF5XmlGui.so.5
#13 0x00007f3cd7a5fe0c in  () at /usr/lib64/libkdeinit5_konsole.so
#14 0x00007f3cd7a60ddc in kdemain () at /usr/lib64/libkdeinit5_konsole.so
#15 0x00007f3cd76b1b05 in __libc_start_main () at /lib64/libc.so.6
#16 0x00000000004007ee in _start ()


PS. Backtraces in #356270 and #359428 look very similar to those in this one.

*** Bug 356270 has been marked as a duplicate of this bug. ***

*** Bug 359428 has been marked as a duplicate of this bug. ***

*** Bug 361841 has been marked as a duplicate of this bug. ***

*** Bug 364653 has been marked as a duplicate of this bug. ***

*** Bug 364839 has been marked as a duplicate of this bug. ***

Created attachment 100810 [details]
New crash information added by DrKonqi

konsole (16.04.3) using Qt 5.7.0

- What I was doing when the application crashed:

Situation the same as reported by Fedora users.
Powered on the machine, logged in, and konsole cashed during Plasma session was restoring.

Used componenets: Plasma 5.7.3, KF-5.25, Qt-5.7.0

-- Backtrace (Reduced):
#5  0x00007ff0309d9970 in Konsole::Session::sessionId() const () from /usr/lib/libkonsoleprivate.so.16
#6  0x00007ff030a0fb48 in Konsole::ViewManager::createTerminalDisplay(Konsole::Session*) () from /usr/lib/libkonsoleprivate.so.16
#7  0x00007ff030a11bdf in Konsole::ViewManager::createView(Konsole::Session*, Konsole::ViewContainer*, int) () from /usr/lib/libkonsoleprivate.so.16
#8  0x00007ff030a16150 in Konsole::ViewManager::createView(Konsole::Session*) () from /usr/lib/libkonsoleprivate.so.16
#9  0x00007ff030a16c71 in Konsole::ViewManager::restoreSessions(KConfigGroup const&) () from /usr/lib/libkonsoleprivate.so.16

Why is this bug still "Unconfirmed", when it has 5 duplicates?

Because no developer was yet able to confirm where the bug is. Is this 100% reproducible for you? If yes, please add exact steps, ideally for a freshly created user account on a standard distribution.

Hmmm this doesn't seem to be reproducible for me anymore. I guess it was fixed by a change in the code for session-restoring or so (I still have the same version of konsole, but there were many updates related to the desktop recently - Linux Mint 18.1 + KDE Plasma 5 here).

I didn't meet this from very long time. I suppose that has been fixed in meantime. I'm not able to reproduce it.

I'm not able to retest this now, sorry.

I haven't seen this issue since a few months.

please reopen if it shows up agagin

I just saw that crash again on Plasma 5 (Linux Mint 18.2)

It was right after I rebooted for the installation of an updated kernel (that shouldn't cause such a crash, though).

Which version of Konsole? I suggest to add an updated backtrace to investigate if this is really the same issue.