program crash

when I click comment area to edit...

date/time : 2011-02-03, 19:18:31, 657ms
computer name : PXL
user name : plusOne <admin>
registered owner : PLUSONE / PLUSONE
operating system : Windows 7 x64 build 7600
system language : Turkish
system up time : 3 days 4 hours
program up time : 29 seconds
processors : 8x Intel(R) Core(TM) i7 CPU Q 720 @ 1.60GHz
physical memory : 1929/4086 MB (free/total)
free disk space : (C:) 36,29 GB
display mode : 1366x768, 32 bit
process id : $7ec
allocated memory : 57,38 MB
executable : heidisql.exe
exec. date/time : 2011-02-03 02:15
version : 6.0.0.3670
compiled with : Delphi XE
madExcept version : 3.0m beta 1
callstack crc : $5020145a, $ca7ed1a1, $ca7ed1a1
exception number : 1
exception class : EAccessViolation
exception message : Access violation at address 00626BF2 in module 'heidisql.exe'. Read of address 00000000.

main thread ($1290):
00626bf2 heidisql.exe VirtualTrees TBaseVirtualTree.DoEdit
00622d3b heidisql.exe VirtualTrees TBaseVirtualTree.WMKeyDown
004d8208 heidisql.exe Controls TControl.WndProc
004dcacc heidisql.exe Controls TWinControl.WndProc
0062f504 heidisql.exe VirtualTrees TBaseVirtualTree.WndProc
004dc16c heidisql.exe Controls TWinControl.MainWndProc
004a56ec heidisql.exe Classes StdWndProc
753b7df5 USER32.dll DispatchMessageW
0057638f heidisql.exe Forms TApplication.ProcessMessage
005763d2 heidisql.exe Forms TApplication.HandleMessage
005766fd heidisql.exe Forms TApplication.Run
00795752 heidisql.exe heidisql 66 +15 initialization
769d3675 kernel32.dll BaseThreadInitThunk

See issue #2291.