Getting _GET_PED_HEAD_BLEND_DATA to work

[Razorwings18]

I'm trying to get the head blend data for a custom multiplayer character; so far every attempt has resulted in a crash.

Since I could find no info around, I'm trying with SET_PED_HEAD_BLEND_DATA parameters. Trying with other parameters resulted in a crash, so this may be on the right track.

So far this has been the most successful try; it won't crash with non-multiplayer Peds, but will for multiplayer ones:

Ped ped = Game.Player.Character; int shapeFirstID=0; int shapeSecondID=0;
int shapeThirdID=0; int skinFirstID=0; int skinSecondID=0;
int skinThirdID=0; float shapeMix=0; float skinMix=0; float thirdMix=0;
bool isParent=false;

Function.Call(Hash._GET_PED_HEAD_BLEND_DATA, ped, shapeFirstID, shapeSecondID,
shapeThirdID, skinFirstID, skinSecondID,
skinThirdID, shapeMix, skinMix, thirdMix,
isParent);

Any push in the right direction will be most welcome.