crash when pressing on data tab

i can not reproduce it but maybe the error will be helpful
operating system : Windows XP Service Pack 3 build 2600
system language : English
system up time : 4 days
program up time : 37 minutes 22 seconds
processors : 2x Intel(R) Pentium(R) 4 CPU 3.00GHz
physical memory : 1634/3063 MB (free/total)
free disk space : (C:) 34.54 GB
display mode : 1280x1024, 32 bit
process id : $11c4
allocated memory : 19.89 MB
executable : heidisql.exe
exec. date/time : 2011-04-03 14:50
version : 6.0.0.3747
compiled with : Delphi XE
madExcept version : 3.0m beta 1
callstack crc : $cbffec66, $77cddb9e, $77cddb9e
exception number : 1
exception class : EAccessViolation
exception message : Access violation at address 0349BDFA in module 'libmysql.dll'. Read of address 00000358.

main thread ($1630):
0349bdfa libmysql.dll mysql_send_query
0349bea0 libmysql.dll mysql_real_query
0073df99 heidisql.exe dbconnection 1266 +20 TMySQLConnection.Query
007466b0 heidisql.exe dbconnection 3102 +3 TMySQLQuery.Execute
007d3f44 heidisql.exe Main 4052 +97 TMainForm.DataGridBeforePaint
00636ba3 heidisql.exe VirtualTrees TBaseVirtualTree.DoBeforePaint
006454c5 heidisql.exe VirtualTrees TBaseVirtualTree.PaintTree
0063d749 heidisql.exe VirtualTrees TBaseVirtualTree.Paint
004f2b43 heidisql.exe Controls TCustomControl.PaintWindow
004ed29d heidisql.exe Controls TWinControl.PaintHandler
004eda7c heidisql.exe Controls TWinControl.WMPaint
004f2add heidisql.exe Controls TCustomControl.WMPaint
0063463d heidisql.exe VirtualTrees TBaseVirtualTree.WMPaint
004e8820 heidisql.exe Controls TControl.WndProc
004e9146 heidisql.exe Controls TControl.WMMouseMove
004e8820 heidisql.exe Controls TControl.WndProc
004ed0e4 heidisql.exe Controls TWinControl.WndProc
00640024 heidisql.exe VirtualTrees TBaseVirtualTree.WndProc
004ec784 heidisql.exe Controls TWinControl.MainWndProc
004aaff4 heidisql.exe Classes StdWndProc
7c90e470 ntdll.dll KiUserCallbackDispatcher