Problem mit masm32 WriteConsole

Hallo warum geht hier mein Consolen Fenster immer sofort wieder zu ?

.486                                    
    .model flat, stdcall                    
    option casemap :none 

include \masm32\include\windows.inc 
include \masm32\include\kernel32.inc 
includelib \masm32\lib\kernel32.lib 
include \masm32\include\user32.inc 
includelib \masm32\lib\user32.lib 

.data

  outhandle  DD ?
  var    DB "ok"

.code
start:

		invoke AllocConsole
		invoke  GetStdHandle,STD_OUTPUT_HANDLE

         mov [outhandle],eax

        invoke  WriteConsole , [outhandle] , var , 2 , 0 ,0
		invoke Sleep , 4000 

        invoke  ExitProcess,0

end start

Hier nochmal das ganze in C

#include <windows.h>

WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{

HANDLE hw;

AllocConsole();

char *buf="ok";

hw = GetStdHandle  ( STD_OUTPUT_HANDLE );
WriteConsole ( hw , buf , 2 , 0 , 0 );

Sleep(4000);

return 0;
}

du übergibst einen ungültigen Zeiger:
->

invoke  WriteConsole, [outhandle] , OFFSET var , 2 , 0 ,0