User session search functionality is not working when a username includes capital letter

Problem

The users with capital letters included in their usernames can't be searched on the current user sessions page.

Environment

Crowd 5.1.2

Steps to Reproduce

1. Create a user with username that includes capital letter/s (i.e. User):
   
2. Open a parallel Crowd session with the new user to be sure that this user has a valid session currently.
3. In the previous page (admin user session), navigate to the Administration > Current sessions > User sessions and verify that you can see both admin and new user (User).
   
4. Search for the new user (User) on the current page.
   
   

Expected Results

You should be able to filter your new user (User).

Actual Results

The search returns no value.

Workaround

No workaround available currently

Notes

The issue is reproduced on Crowd 5.2.0