Actor tool input schema enum cannot be empty string

[MQ37]

For this URL https://mcp.apify.com?tools=compass/google-maps-extractor the Google ADK returns this error and MCP inspector crashes.

Error:

google.genai.errors.ClientError: 400 INVALID_ARGUMENT. {'error': {'code': 400, 'message': '* GenerateContentRequest.tools[0].function_declarations[0].parameters.properties[placeMinimumStars].enum[0]: cannot be empty\n* GenerateContentRequest.tools[0].function_declarations[0].parameters.properties[countryCode].enum[0]: cannot be empty\n', 'status': 'INVALID_ARGUMENT'}}

MCP inspector console error:

Error: A <Select.Item /> must have a value prop that is not an empty string. This is because the Select value can be set to an empty string to clear the selection and show the placeholder.