D3D Menue crashes if i join a game ...

D3DVIEWPORT9  g_ViewPort;
LPD3DXFONT g_pFont;

void DrawString(int x, int y, DWORD color, const char *fmt, ...)
{
	RECT FontPos = { x, y, x + 120, y + 16 };
	char buf[1024] = {'\0'};
	va_list va_alist;

	va_start(va_alist, fmt);
	vsprintf(buf, fmt, va_alist);
	va_end(va_alist);

	g_pFont->DrawText(NULL, buf, -1, &FontPos, DT_NOCLIP, color);
}

HRESULT WINAPI hkEndScene (LPDIRECT3DDEVICE9 pDevice)
{

    if(g_pFont == NULL) D3DXCreateFont(pDevice, 15, 0, FW_BOLD, 1, 0, DEFAULT_CHARSET, OUT_DEFAULT_PRECIS, ANTIALIASED_QUALITY, DEFAULT_PITCH | FF_DONTCARE, "Verdana", &g_pFont);

    pDevice->GetViewport(&g_ViewPort);
    DrawString(g_ViewPort.Width/2,g_ViewPort.Height/2, 0xFF00FF00, "Values Saved");
    return oEndScene (pDevice);
}