Maps: Searching with no query searches for text "Undefined"

To reproduce:

Open maps without a search query. Search button is disabled as the search field is empty.
Select some named location on the map, opening the side-bar with details. The search field is still empty but now the button is enabled.
Click the button, navigating to https://kagi.com/maps/search without any query
Maps searches for text "Undefined," and focusses on the one result: "Undefined", a restaurant in Ontario.

Or:

The search button should be disabled if the search field is empty, even if the left-column is open.

Navigating directly to https://kagi.com/maps/search should probably just navigate to https://kagi.com/maps . Maybe focus the search bar.