QT program Anki keeps crashing

QT program Anki keeps crashing on Debian/Ubuntu.

This report is a follow up of bug report:
https://bugreports.qt.io/browse/QTBUG-51126
So, please don't close this discussion and confirm if you still experience this bug. I will try to monitor information and keep updating if new reports occur on other sites.

I tested on Kubuntu 16.04 with Breeze theme
Here are both reports from KDE4 Kubuntu 14.04 and Plasma5 from Kubuntu 16.04
http://pastebin.com/GG9NY4aK
(also attached)

I am not sure about what exact version of qt is in Kubuntu 16.04. because packages have different names (not just qt). I hope you have more experience to identify.

For me it happens when I press edit button, or edit color, or switch to night mode using add-on
https://ankiweb.net/shared/info/1496166067

To recreate this bug you may install Anki (on Kubuntu 16.04 with Breeze or qtcurve theme) from
http://ankisrs.net/
from Ubuntu/Debian deb package 2.0.36 and try to recreate problem.
I can send sample Anki deck to email address or it can be downloaded directly from another Anki site
https://ankiweb.net/shared/decks/english

Previous threads:
https://anki.tenderapp.com/discussions/ankidesktop/7794-anki-continues-to-repeatedly-crash
https://anki.tenderapp.com/discussions/ankidesktop/14722-anki-crashes-on-linux?unresolve=true
https://anki.tenderapp.com/discussions/ankidesktop/18092-anki-periodically-crashes-on-debian-sid
https://anki.tenderapp.com/discussions/ankidesktop/17033-anki-intermittently-segfaults-after-suspend-on-ubuntu-linux
Reported also on Ubuntu launchpad.
https://bugs.launchpad.net/ubuntu/+source/qt4-x11/+bug/1495274
and Kubuntu forum
https://www.kubuntuforums.net/showthread.php?68898-Anki-crashes-hangs

Please help at least to find out where is the real cause of the problem and report it to appropriate people.

Feel free to ask questions about details. I will try to provide to the best of my ability.

Discussion on Anki support forum
https://anki.tenderapp.com/discussions/ankidesktop/18360-anki-keeps-crashing-on-kubuntu-1604