Closing HeidiSQL results in crash

Bug report:

date/time : 2014-01-31, 21:29:28, 81ms
computer name : xxx
user name : xxx
registered owner : xxx
operating system : Windows 7 x64 Service Pack 1 build 7601
system language : German
system up time : 1 hour 20 minutes
program up time : 29 minutes 22 seconds
processors : 8x Intel(R) Core(TM) i7-3630QM CPU @ 2.40GHz
physical memory : 5589/8078 MB (free/total)
free disk space : (C:) 120,43 GB
display mode : 1920x1080, 32 bit
process id : $193c
allocated memory : 51,77 MB
largest free block : 8185,68 GB
executable : heidisql.exe
exec. date/time : 2014-01-25 11:34
version : 8.3.0.4694
compiled with : Delphi XE5
madExcept version : 4.0.8.1
callstack crc : $b7eab278, $0e31255f, $0e31255f
exception number : 1
exception class : EOSError
exception message : System Error. Code: 1400. Ungültiges Fensterhandle.

main thread ($123c):
0048390e heidisql.exe System.SysUtils RaiseLastOSError
0048386e heidisql.exe System.SysUtils RaiseLastOSError
00699214 heidisql.exe Vcl.Controls TWinControl.DestroyWindowHandle
00696098 heidisql.exe Vcl.Controls TWinControl.Destroy
006960cd heidisql.exe Vcl.Controls TWinControl.Destroy
006a3cfc heidisql.exe Vcl.Controls TCustomControl.Destroy
006960cd heidisql.exe Vcl.Controls TWinControl.Destroy
00800b3e heidisql.exe Vcl.Forms TScrollingWinControl.Destroy
00802812 heidisql.exe Vcl.Forms TCustomForm.Destroy
0040c395 heidisql.exe System TObject.Free
005d6cd9 heidisql.exe System.Classes TComponent.DestroyComponents
007feff6 heidisql.exe Vcl.Forms DoneApplication
00472f80 heidisql.exe System.SysUtils DoExitProc
0040f339 heidisql.exe System @Halt0
00c36c66 heidisql.exe heidisql 79 +26 initialization
7719652b kernel32.dll BaseThreadInitThunk