Access violation at address 0075B574

Today on build 3560 I got this error when switching from one tab to another:

date/time : 2010-10-08, 23:54:30, 109ms
computer name : KOTY
user name : Michal <admin>
registered owner : XXX
operating system : Windows XP Dodatek Service Pack 3 build 2600
system language : Polish
system up time : 20 minutes 5 seconds
program up time : 14 minutes 15 seconds
processor : AMD Athlon(tm) XP 3000+
physical memory : 673/1279 MB (free/total)
free disk space : (D:) 1,30 GB
display mode : 1680x1050, 32 bit
process id : $124
allocated memory : 17,97 MB
executable : heidisql.exe
exec. date/time : 2010-10-08 23:40
version : 5.1.0.3560
compiled with : Delphi 2010
madExcept version : 3.0k
callstack crc : $e1de972e, $735d47e9, $735d47e9
exception number : 1
exception class : EAccessViolation
exception message : Access violation at address 0075B574 in module 'heidisql.exe'. Read of address 0000008C.

main thread ($770):
0075b574 heidisql.exe mysql_connection 831 +7 TMySQLConnection.GetServerVersionInt
006c8348 heidisql.exe Main 4308 +17 TMainForm.ValidateControls
006c780b heidisql.exe Main 4107 +22 TMainForm.PageControlMainChange
004fbe95 heidisql.exe ComCtrls TCustomTabControl.Change
004fd519 heidisql.exe ComCtrls TPageControl.Change
004fc951 heidisql.exe ComCtrls TCustomTabControl.CNNotify
0053ab60 heidisql.exe Controls TControl.WndProc
0053f428 heidisql.exe Controls TWinControl.WndProc
0053a784 heidisql.exe Controls TControl.Perform
0053f57b heidisql.exe Controls DoControlMsg
00540005 heidisql.exe Controls TWinControl.WMNotify
0053ab60 heidisql.exe Controls TControl.WndProc
0053f428 heidisql.exe Controls TWinControl.WndProc
0053eac8 heidisql.exe Controls TWinControl.MainWndProc
0049a524 heidisql.exe Classes StdWndProc
7e3792de USER32.dll SendMessageW
773db16c comctl32.dll #342
7e37a034 USER32.dll CallWindowProcW
0053f528 heidisql.exe Controls TWinControl.DefaultHandler
0053b1dd heidisql.exe Controls TControl.WMLButtonDown
004fe071 heidisql.exe ComCtrls TPageControl.WMLButtonDown
0053ab60 heidisql.exe Controls TControl.WndProc
0053f428 heidisql.exe Controls TWinControl.WndProc
00562128 heidisql.exe Forms TCustomForm.WndProc
0053eac8 heidisql.exe Controls TWinControl.MainWndProc
0049a524 heidisql.exe Classes StdWndProc
7e368a0b USER32.dll DispatchMessageW
0056b229 heidisql.exe Forms TApplication.ProcessMessage
0056b26e heidisql.exe Forms TApplication.HandleMessage
0056b599 heidisql.exe Forms TApplication.Run
007a6742 heidisql.exe heidisql 66 +15 initialization


When I pressed 'continue application' I got another error like this:

date/time : 2010-10-08, 23:57:33, 687ms
computer name : KOTY
user name : Michal <admin>
registered owner : XXX
operating system : Windows XP Dodatek Service Pack 3 build 2600
system language : Polish
system up time : 23 minutes 8 seconds
program up time : 17 minutes 19 seconds
processor : AMD Athlon(tm) XP 3000+
physical memory : 672/1279 MB (free/total)
free disk space : (D:) 1,30 GB
display mode : 1680x1050, 32 bit
process id : $124
allocated memory : 20,09 MB
executable : heidisql.exe
exec. date/time : 2010-10-08 23:40
version : 5.1.0.3560
compiled with : Delphi 2010
madExcept version : 3.0k
callstack crc : $acc7b931, $86af495f, $86af495f
exception number : 7
exception class : EAccessViolation
exception message : Access violation at address 006DB418 in module 'heidisql.exe'. Read of address 00000098.

main thread ($770):
006db418 heidisql.exe Main 9669 +6 TMainForm.treeQueryHelpersGetText
006300b8 heidisql.exe VirtualTrees TCustomVirtualStringTree.DoGetText
0062f424 heidisql.exe VirtualTrees TCustomVirtualStringTree.GetText
0062fd86 heidisql.exe VirtualTrees TCustomVirtualStringTree.ColumnIsEmpty
00627e28 heidisql.exe VirtualTrees TBaseVirtualTree.GetHitTestInfoAt
0040a87d heidisql.exe System 548 +0 @IntfCopy
0061fbb7 heidisql.exe VirtualTrees TBaseVirtualTree.HandleHotTrack
00622583 heidisql.exe VirtualTrees TBaseVirtualTree.MouseMove
0053b486 heidisql.exe Controls TControl.WMMouseMove
0053ab60 heidisql.exe Controls TControl.WndProc
0053f428 heidisql.exe Controls TWinControl.WndProc
00625288 heidisql.exe VirtualTrees TBaseVirtualTree.WndProc
0053eac8 heidisql.exe Controls TWinControl.MainWndProc
0049a524 heidisql.exe Classes StdWndProc
7e368a0b USER32.dll DispatchMessageW
0056b229 heidisql.exe Forms TApplication.ProcessMessage
0056b26e heidisql.exe Forms TApplication.HandleMessage
0056b599 heidisql.exe Forms TApplication.Run
007a6742 heidisql.exe heidisql 66 +15 initialization

Is that reproducible for you? I'm failing to reproduce that here, in any combination I can imagine.

I can't reproduce it either. So far this has been a one-time occurrence, probably due to some obscure reasons. I'll let you know if it happens again.

Thanks for the update!