Charts from a MySQL database

I have a MySQL database. I would like to insert a chart to a page.
Inserting charts using Google Spreadsheet data works fine, but when I change the data source to a database, it shows not the chart, but a table with data.
[gdoc key=”mysql://user:password@database_url_address/database_name” chart=”Area” title=”My_title” use_cache=”no” query=”SELECT value, year, quarter FROM database_name.database_view WHERE year=’2018′”]
Right now it shows not a chart, but a table with (correct) data. What am I doing wrong? How can I get a chart instead of a table?

The page I need help with: [log in to see the link]