[Developer Console] "parse error" when testing with normal user

Description of problem:

When a non-admin user adds Severity filter, the Aggregated Logs page shows "parse error at line 1, col 113: syntax error: unexpected STRING"

Version-Release number of selected component (if applicable):

OCP 4.12
Logging 5.6

How reproducible:

Always

Steps to Reproduce:

1. Enable Console plugin
2. Create test projects using normal user
3. Login to Openshift console as a normal user
4. Switch to Developer mode
5. Go to 'Aggregated logs' in 'Observe' menu
6. Select the severity 'unknown' from the drop down  and click 'Run Query' button

Actual results:

Expected results:

No error