[kmail2] [Bug 449826] New: Kmail crashes the moment an encrypted email is selected

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https://bugs.kde.org/show_bug.cgi?id=449826

            Bug ID: 449826
           Summary: Kmail crashes the moment an encrypted email is
                    selected
           Product: kmail2
           Version: 5.19.2
          Platform: Archlinux Packages
                OS: Linux
            Status: REPORTED
          Severity: crash
          Priority: NOR
         Component: message list
          Assignee: kdepim-bugs at kde.org
          Reporter: thomas at zell-mbc.com
  Target Milestone: ---

SUMMARY
***
I am using S/MIME encrypted emails quite heavily, however after a OS reboot
yesterday, Kmail would crash immediately at launch.
After some investigation it turned out that the mail Kmail tried to display
during start was encrypted. After removing that email via AkonadiConsole Kmail
starts again, but the moment I click on another encrypted email it will crash
again.
***


STEPS TO REPRODUCE
1. Launch Kmail
2. Select S/MIME encrypted email in message list
3. Crash

OBSERVED RESULT
Crash

EXPECTED RESULT
Show the email content

SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.23.5
KDE Frameworks Version: 5.90.0
Qt Version: 5.15.2
Kernel Version: 5.16.7-arch1-1 (64-bit)
Graphics Platform: X11
Processors: 8 × Intel® Core™ i7-6920HQ CPU @ 2.90GHz
Memory: 31,1 GiB of RAM
Graphics Processor: Mesa Intel® HD Graphics 530

ADDITIONAL INFORMATION
Starting kmail from within a terminal shows the below, the flite message is a
red herring in my opinion, it's not installed and shows right after the start,
not at the time of the crash. I did install flite to see what happens to the
error, no effect other than that flite message disappearing, so removed again. 
Things will be quiet until I select an encrypted message which immediately
leads to the signal 11 message and a lengthy systemd-coredump in journalctl.

´´´
kmail
Error loading text-to-speech plug-in "flite"
Cannot initialize model with data QJsonObject(). missing: QJsonValue(string,
"urls")
 list count   1
 list count   1
*** KMail got signal 11 (Exiting)
*** Dead letters dumped.
KCrash: crashing... crashRecursionCounter = 2
KCrash: Application Name = kmail path = /usr/bin pid = 8909
KCrash: Arguments: /usr/bin/kmail 
QSocketNotifier: Invalid socket 10 and type 'Read', disabling...
QSocketNotifier: Invalid socket 20 and type 'Read', disabling...
QSocketNotifier: Invalid socket 59 and type 'Read', disabling...
QSocketNotifier: Invalid socket 98 and type 'Read', disabling...
failed to signal syncobj 35
Unable to start Dr. Konqi
Re-raising signal for core dump handling.
[1]    8909 abort (core dumped)  kmail
´´´

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