Crash report: running a complex query

date/time         : 2011-06-15, 17:28:18, 742ms
computer name     : SOFT14
operating system  : Windows XP Service Pack 3 build 2600
system language   : Spanish
system up time    : 8 days 8 hours
program up time   : 36 minutes 16 seconds
processors        : 2x Intel(R) Pentium(R) 4 CPU 3.00GHz
physical memory   : 194/991 MB (free/total)
free disk space   : (C:) 4,55 GB (E:) 10,82 GB
display mode      : 1280x1024, 32 bit
process id        : $17f0
allocated memory  : 10,90 MB
executable        : heidisql.exe
exec. date/time   : 2011-06-07 09:27
version           : 6.0.0.3872
compiled with     : Delphi XE
madExcept version : 3.0m beta 1
callstack crc     : $1f9b7910, $5c373827, $5c373827
exception number  : 1
exception class   : EAccessViolation
exception message : Access violation at address 7C920829 in module 'ntdll.dll'. Read of address 02A13DA5.
thread $d7c (TQueryThread):
7c920829 ntdll.dll                          RtlFreeHeap
0272bf88 libmysql.dll                       mysql_store_result
0073c914 heidisql.exe dbconnection 1315 +32 TMySQLConnection.Query
006af022 heidisql.exe helpers      2725 +40 TQueryThread.Execute
00407358 heidisql.exe System        548  +0 ThreadWrapper
004605b1 heidisql.exe madExcept             CallThreadProcSafe
0046061b heidisql.exe madExcept             ThreadExceptFrame
>> created by main thread ($b40) at:
006aed7a heidisql.exe helpers      2660  +1 TQueryThread.Create
main thread ($b40):
00000000 heidisql.exe madStackTrace +0 StackAddrToStr
>> stack will be calculated soon