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pawn Код:

if(!IsPlayerInVehicle(GetPlayerVehicleID(playerid)))//Seems wrong.

if(IsPlayerInVehicle(playerid, VehicleID))//This is how I have seen it. Two parts playerid, vehicleid.

if(!IsPlayerInVehicle(KidnapID, GetPlayerVehicleID(playerid)))//So try this. Not tested.

pawn Код:

if(GetPlayerVehicleID(KidnapID) != GetPlayerVehicleID(playerid))//Not tested.

I would test for you but got work. Sorry.