check missing font do not work

Hi all,

I have some troubles to check if a font is correcty installed. I'm writting a script who use the property character.appliedFont.location.

1) I would like to check if the fonts in the document are correcty installed (The fonts are installed in the document only -> a folder Document fonts with a package).

- But if I check each font in the document -> every font is installed

- Then if I would like to use my property from a textframe object I figure it out that the font isn't installed

I do not understand why the result of font.status is different when I called it from a textframe?

if (document === undefined) {
   var document = app.activeDocument;
}
var fonts = document.fonts.everyItem().getElements();

for(var i = 0; i < fonts.length; i++){

   if(fonts[i].status !== FontStatus.INSTALLED) {
   //return true;
   alert('no font are uninstalled');
  }
}
var textframes = document.pages[0].textFrames;

/**
 * @todo ask why this function do not work!!!
 */
for (var i = 0; i < textframes.length; i++) {

   if (textframes[i].characters[0].appliedFont.status !== FontStatus.INSTALLED) {
   alert('every textframe font are unavailable');
  }
}
return false;

I advance, thank you for the reply

Best regards.