After update unity version from 4.7 to 5.5 project crushing on quit(Application.Quit());
What does the log file say? Do you have a crash dump?
Yes, I have a crush dump and I sent report to Unity 3 days ago. Log file say only “Crash!!!” Here is dump report
2886688–212095–2016-12-12_173306.zip (25.6 KB)
Looks like it may be physics related.
Take a look at the upgrade guide, maybe you need to change something: https://docs.unity3d.com/Manual/UpgradeGuide5-Physics.html
Thank you for your reply.