Created attachment 946292 [details]
network exception when sorting the cases

Description of problem:
as summary.

Version-Release number of selected component (if applicable):
v3.8.11-2 on devel server.

How reproducible:
100%

Steps to Reproduce:
1.open a test plan with some cases.
2.then click case id or its summary to sort .
Check the system and console whether this can sort the cases.

Actual results:
after clicking case's id,the page would stay in loading and there are some type errors in the console.So can't order the cases for now.

Expected results:
all the cases should be in order by case id or summary instead of loading or errors.

Additional info: