Crash when accessing database tab.

How to reproduce :

• Connected to an SQL Server, go to "Host: xxx" tab, under that tab go to "Databases" tab, press CTRL-A, right click "Fetch database items".
• Switch from "Host: xxx" to "Database: xxx" tab, crash ensues.

Thanks for all your work.

date/time          : 2016-10-06, 14:27:32, 548ms
operating system   : Windows 8 x64 build 9200
system language    : English
system up time     : 8 days 5 hours
program up time    : 10 seconds
processors         : 4x Intel(R) Core(TM) i7-4600U CPU @ 2.10GHz
physical memory    : 7651/16281 MB (free/total)
free disk space    : (C:) 116.35 GB
display mode       : 1920x1080, 32 bit
process id         : $141c
allocated memory   : 84.30 MB
largest free block : 8182.68 GB
executable         : heidisql64.exe
exec. date/time    : 2016-10-06 14:27
version            : 9.3.0.5120
compiled with      : Delphi XE5
madExcept version  : 4.0.12
callstack crc      : $2222c4b9, $d60bc318, $d60bc318
exception number   : 1
exception class    : EAccessViolation
exception message  : Access violation at address 0000000000A8ADE9 in module 'heidisql64.exe'. Read of address FFFFFFFFFFFFFFFF.

main thread ($2ca0):
00a8ade9 heidisql64.exe dbconnection    1345   +1 TConnectionParameters.GetImageIndex
00ab7c84 heidisql64.exe dbconnection    6908   +3 TDBObject.GetImageIndex
00c3ff70 heidisql64.exe Main            5250   +6 TMainForm.ListTablesGetImageIndex
008e1f1d heidisql64.exe VirtualTrees   19958   +8 TBaseVirtualTree.DoGetImageIndex
008e5eef heidisql64.exe VirtualTrees   21618   +6 TBaseVirtualTree.GetImageIndex
008fa27a heidisql64.exe VirtualTrees   30263 +255 TBaseVirtualTree.PaintTree
008eaa47 heidisql64.exe VirtualTrees   23549  +23 TBaseVirtualTree.Paint
006a5666 heidisql64.exe Vcl.Controls              TCustomControl.PaintWindow
0069c413 heidisql64.exe Vcl.Controls              TWinControl.PaintHandler
0069d2af heidisql64.exe Vcl.Controls              TWinControl.WMPaint
006a55f8 heidisql64.exe Vcl.Controls              TCustomControl.WMPaint
008dc4a1 heidisql64.exe VirtualTrees   17412   +8 TBaseVirtualTree.WMPaint
0040cb1e heidisql64.exe System                    TObject.Dispatch
00694ab3 heidisql64.exe Vcl.Controls              TControl.WndProc
0069c17e heidisql64.exe Vcl.Controls              TWinControl.WndProc
008ef34e heidisql64.exe VirtualTrees   25273  +32 TBaseVirtualTree.WndProc
0069b3ba heidisql64.exe Vcl.Controls              TWinControl.MainWndProc
005dbcf3 heidisql64.exe System.Classes            StdWndProc
7fe43224 ntdll.dll                                KiUserCallbackDispatcher
7fe41803 user32.dll                               DispatchMessageW
008145cf heidisql64.exe Vcl.Forms                 TApplication.ProcessMessage
00814643 heidisql64.exe Vcl.Forms                 TApplication.HandleMessage
00814b2f heidisql64.exe Vcl.Forms                 TApplication.Run
00c84457 heidisql64.exe heidisql          79  +24 initialization
7fe416c1 KERNEL32.DLL                             BaseThreadInitThunk
7fe4325d ntdll.dll                                RtlUserThreadStart