Created attachment 914663[details]
[test plan]Save the changes of test plan in plan edit page, system go to error page.
Description of problem:
as summary.
Version-Release number of selected component (if applicable):
v3.8.9-1 on test server
How reproducible:
sometimes.
Steps to Reproduce:
1.Enter a test plan detail page, then click edit btn to enter plan edit page.
https://tcms-test.app.eng.nay.redhat.com/plan/13571/
2.Click save btn.
Actual results:
system go to error page.
Expected results:
system save the changes successfully.
Additional info: