Here are the steps to reproduce:
1. Run the generated demo web application via browser,
2. Login as admin,
3. Go to Orders list page,
4. Choose "Alfreds Futterkiste (ALFKI)" from "Custom ID" in extended search and hit "Search" button,
5. The search result is displayed correctly,
6. Click on "Filters" button, and choose "Save current filter",
7. In the prompt dialog window, do not enter anything, and just click on Cancel button,
8. Click on "Filters" button again, and you will see there is "null" filter name appended in the Filters dropdown menu.