gflFreeBitmapData crashes

[Grincheux]

My image already is loaded and no problem.
When I call , it .
The pointer passed to the function is good.
What are the reasons that this function can ?

Exception non gérée à 0x0000000180046750 dans Picture.exe : 0xC0000005: Violation d'accès lors de la lecture de l'emplacement 0x0000012c00000008.

I tried with gflFreeBitmap but the same error is coming.

I am on Windows 7 pro and I use Lib64.dll