[Administrator Console] Seeing "parse error" while using Severity filter for cluster view user user

Description of problem:

Seeing "parse error" while using Severity filter for non-admin user with admin/view role in Administrator console

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

logging 5.6

How reproducible:

Always

Steps to Reproduce:

1. Enable the "Console plugin" by following the testing steps in the doc
2. Assign view/admin role to a non-admin user
ex,  testuser-0: oc adm policy add-cluster-role-to-user view testuser-0
3. Create an application for logs with testuser-0
4. Login to openshift web console with testuser-0
5. Go to 'Observe' menu -> Click on Logs
6. Select a severity from the drop down, then click on "Run Query" button

Actual results:

parse error at line 1, col 1970: syntax error: unexpected STRING

Expected results:

No error