[Typo3] $this->cObj->data["pi_flexform"] is emtpy, pi_getFFvalue not work

[Richard]

when I debug  $this->cObj->data["pi_flexform"]  is emtpy

I think is normale the pi_getFFvalue function not work  if
$this->cObj->data["pi_flexform"]  is emtpy

Why $this->cObj->data["pi_flexform"] ?

Richard :)