[NTG-context] \setupheadertexts except on pages with title of chapter

Hello, I would like that on the pages with the title of the chapter the header is empty. Fabrice \setupheadertexts[{\getmarking[section]}][pagenumber] [{\getmarking[chapter]}][pagenumber] \setuppagenumbering[alternative=,location=] \starttext \placelist[chapter,section][alternative=c] \startchapter[title={First chapter}] \startsection[title={First section}] \dorecurse{5}{\input knuth} \stopsection \stopchapter \startchapter[title={Second chapter}] \startsection[title={Second section}] \dorecurse{5}{\input knuth} \stopsection \stopchapter \stoptext