Created attachment 898301 [details] Update cases to run in assigncase page, system will go to 500 error page in the following case Description of problem: as subject. Version-Release number of selected component (if applicable): v3.8.8-1 on devel server. How reproducible: 100% Steps to Reproduce: 1.Enter a run detail page. https://tcms-devel.app.eng.nay.redhat.com/run/72323/ 2.Click 'cases-add' link to enter assigncase page. 3.Choose a case. 4.Change the case's status from confirm to proposed. 5.Come back to assigncase page, click update btn. Actual results: system go to 500 error page. Expected results: system show warning: checked cases have changed, please choose again. confirm the warning, system stay assigncase page and system refresh the page. Additional info: