Can't get the Query parameter to pick up searches

I have entered “search_block_form” in the Query parameter field, but the Site Search Keywords block is empty, and says “There is no data for this report.”

I noticed that the Query parameter “search_block_form” appears twice in the URL, so perhaps that’s why Piwik doesn’t pick up the searches, because Piwik only sees the last instance, which is empty? Is there a workaround for this?

The URL: http://example.com/search?search_block_form=the_searched_text&form_build_id=form-2-uAQg&form_id=search_block_form

It seems to work now, so it was probably just because cron hadn’t run for a while, or something like that…