[Bug] Crashes on save of adding / editing index columns

date/time          : 2014-11-28, 17:40:15, 455ms
computer name      : KDAVIS
wts client name    : KDAVISHOME
user name          : keithdavis <admin>
registered owner   : P.R.I.D.E. Employee / P.R.I.D.E.
operating system   : Windows 7 x64 Service Pack 1 build 7601
system language    : English
system up time     : 4 days 6 hours
program up time    : 4 minutes 41 seconds
processors         : 6x AMD FX(tm)-6100 Six-Core Processor
physical memory    : 6751/16299 MB (free/total)
free disk space    : (C:) 68.71 GB
display mode       : 1920x1200, 16 bit
process id         : $1410
allocated memory   : 64.36 MB
largest free block : 8181.28 GB
executable         : heidisql.exe
exec. date/time    : 2014-11-26 12:18
version            : 9.1.0.4880
compiled with      : Delphi XE5
madExcept version  : 4.0.8.1
callstack crc      : $41cc7730, $e78e4848, $e78e4848
exception number   : 1
exception class    : EAccessViolation
exception message  : Access violation at address 00000000005E4F7B in module 'heidisql.exe'. Read of address 0000000000000000.
main thread ($c91c):
005e4f7b heidisql.exe System.Classes        {System.Generics.Collections}TDictionary<System.Integer,System.Classes.IInterfaceList>.Hash
005e5e8f heidisql.exe System.Classes        {System.Generics.Collections}TDictionary<System.Integer,System.Classes.IInterfaceList>.TryGetValue
005dc6d2 heidisql.exe System.Classes        TObservers.IsObserving
006c9699 heidisql.exe Vcl.StdCtrls          TCustomComboBox.KeyDown
0069d90b heidisql.exe Vcl.Controls          TWinControl.DoKeyDown
006c7f5c heidisql.exe Vcl.StdCtrls          TCustomCombo.ComboWndProc
006ca7cf heidisql.exe Vcl.StdCtrls          TCustomComboBox.ComboWndProc
006c7bad heidisql.exe Vcl.StdCtrls          TCustomCombo.EditWndProc
005da993 heidisql.exe System.Classes        StdWndProc
771f98d5 USER32.dll                         DispatchMessageW
0081326f heidisql.exe Vcl.Forms             TApplication.ProcessMessage
008132e3 heidisql.exe Vcl.Forms             TApplication.HandleMessage
008137cf heidisql.exe Vcl.Forms             TApplication.Run
00c58ea7 heidisql.exe heidisql       77 +24 initialization
770d59eb kernel32.dll                       BaseThreadInitThunk