Switching from "Exemptions" tab to "List of limited accounts" tab in Rate limiting admin page causes page to go blank

Issue Summary

Switching from "Exemptions" tab to "List of limited accounts" tab in Rate limiting admin page causes page to go blank when a user in the Exemptions tab has not been rate limited in the past

This is reproducible on Data Center: yes

Steps to Reproduce

1. Add a user to the exemption list that has not been rate limited - example user "anonymous"
2. switch to the "List of limited accounts" tab

Expected Results

The "List of limited accounts" tab loads a list of users that has been limited

Actual Results

The Rate Limit page goes blank:

The below exception is thrown in the browser console:

Workaround

Refresh the page