This looks specific to 2022 editor versions, see below. Only occurs if you name the new table with the original name of the renamed table.

Repro:
1. Open attached project.
2. Window -> Asset Management -> Localization Tables.
3. In 'Edit Table Collection', select TestTable.
4. Change the 'Table Collection Name' field to anything.
5. Click 'New Table Collection' Tab. Create a new string table named TestTable. Save it in the Assets folder.

Expected Result: A second table is created.
Actual Result: Causes two issues.
- NullReferenceException appears in console, renamed string table collection gets replaced.
- Closing the Localization Tables window and opening it again gives you a blank window and a different NullReferenceException.

Reproducible in: 2022,2.0a2, 2022.1.0b2, 2022.1.0a7
Not Reproducible in: 2022.1.0a6, 2021.2.7f1, 2020.3.25f1, 2019.4.34f1

Tested with package versions 1.1.0 and 1.0.0.

Notes:
- Deleting the table data and re-opening Localization Tables fixes the second listed issue.
- Didn't try older package versions as it seems to be editor specific. Ping me for further testing if needed.
- The errors are attached in the .txt