[NTG-context] \structureheadnumber does not work before first section

Hi, I'm trying to get the last section number using \structureheadnumber[section][last]. This works fine inside a section, but expands to nothing when used at the beginning of the document. Here is a minimal example: \starttext Last: \structureheadnumber[section][last] \dorecurse{4} {\section{Test #1} Last: \structureheadnumber[section][last]} \stoptext Vianney