C# Forms application crashes after I re-open a secondary form

Question

I'm having this issue with my C# Forms application. I loaded an Hebrew font into the app and I noticed it crashes the program when I re-open a form using a button.

InitializeComponent();
InitCustomLabelFont();


private void InitCustomLabelFont()
        {

            //Create your private font collection object
            PrivateFontCollection pfc = new PrivateFontCollection();

            //Select your font from the resources.
            int fontLength = Properties.Resources.SecularOne_Regular.Length;

            // create a buffer to read in to
            byte[] fontdata = Properties.Resources.SecularOne_Regular;

            // create an unsafe memory block for the font data
            System.IntPtr data = Marshal.AllocCoTaskMem(fontLength);

            // copy the bytes to the unsafe memory block
            Marshal.Copy(fontdata, 0, data, fontLength);

            // pass the font to the font collection
            pfc.AddMemoryFont(data, fontLength);

            // using the font...
            headerLbl.Font = new Font(pfc.Families[0], 20);
            loginBtn.Font = new Font(pfc.Families[0], 18);
            ...
            ...
        }

I have this InitCustomLabelFont() function on Form1 and Form2. Form1 has a button that opens Form2. I noticed that when I re-open Form2 after I closed it I get a:

System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt

Does anyone has an idea why my app crashes?

*** EDIT ***

    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Form1()); //this is where it crashes
        }

    }

Answer 1

Thanks everybody it works now!

the thing was:

        private void RegisterForm_FormClosing(Object sender, FormClosingEventArgs e) 
        {
            pfc.Dispose();
        }

while putting

private PrivateFontCollection pfc = new PrivateFontCollection();

above the public Form1()