Access violation when closing the form that has floating component - c++builder

Question

I have a C++Builder VCL application that has some dynamically created components on it. These components should be able to dock and undock from a Panel.
The problem is, if the user closes the form while one of these components are undocked (Floating), I get an error:
First chance exception at $50C278EF. Exception class $C0000005 with message 'access violation at 0x50c278ef: read of address 0x00000010'. Process Project1.exe (8004)
Here is a simplified sample that demonstrate the problem:
The HPP:
//---------------------------------------------------------------------------
#ifndef Unit1H
#define Unit1H
//---------------------------------------------------------------------------
#include <System.Classes.hpp>
#include <Vcl.Controls.hpp>
#include <Vcl.StdCtrls.hpp>
#include <Vcl.Forms.hpp>
#include <Vcl.ExtCtrls.hpp>
//---------------------------------------------------------------------------
class TForm1 : public TForm
{
__published: // IDE-managed Components
TPanel *Panel1;
TPanel *Panel2;
void __fastcall FormCreate(TObject *Sender);
void __fastcall FormDestroy(TObject *Sender);
private: // User declarations
TPanel *Panel3;
public: // User declarations
__fastcall TForm1(TComponent* Owner);
};
//---------------------------------------------------------------------------
extern PACKAGE TForm1 *Form1;
//---------------------------------------------------------------------------
#endif
The CPP
//---------------------------------------------------------------------------
#include <vcl.h>
#pragma hdrstop
#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
: TForm(Owner)
{
}
//---------------------------------------------------------------------------
void __fastcall TForm1::FormCreate(TObject *Sender)
{
Panel3 = new TPanel((TComponent*)nullptr);
Panel3->Parent = Panel1;
Panel3->Width = 50;
Panel3->Height = 50;
Panel3->DragKind = dkDock;
Panel3->DragMode = dmAutomatic;
}
//---------------------------------------------------------------------------
void __fastcall TForm1::FormDestroy(TObject *Sender)
{
delete Panel3;
}
//---------------------------------------------------------------------------
The DFM
object Form1: TForm1
Left = 0
Top = 0
Caption = 'Form1'
ClientHeight = 299
ClientWidth = 635
Color = clBtnFace
Font.Charset = DEFAULT_CHARSET
Font.Color = clWindowText
Font.Height = -11
Font.Name = 'Tahoma'
Font.Style = []
OldCreateOrder = False
OnCreate = FormCreate
OnDestroy = FormDestroy
PixelsPerInch = 96
TextHeight = 13
object Panel1: TPanel
Left = 128
Top = 48
Width = 409
Height = 217
Caption = 'Panel1'
DockSite = True
TabOrder = 0
object Panel2: TPanel
Left = 216
Top = 8
Width = 185
Height = 97
Caption = 'Panel2'
DragKind = dkDock
DragMode = dmAutomatic
TabOrder = 0
end
end
end
In this example, if Panel3 is Floating and the user closes that form, we get the exception.