Crash report

I executed a SELECT statement from a query tab. Then I realised it was going to retrieve too many rows so I interrupted it with the "Cancel running operation" button, edited the code to append a LIMIT 50 clause and hit "Execute SQL" again.

date/time         : 2012-01-26, 10:50:43, 211ms
computer name     : SOFT14
operating system  : Windows XP Service Pack 3 build 2600
system language   : Spanish
system up time    : 6 days 1 hour
program up time   : 53 minutes 20 seconds
processors        : 2x Intel(R) Pentium(R) 4 CPU 3.00GHz
physical memory   : 240/991 MB (free/total)
free disk space   : (C:) 8,68 GB (E:) 6,45 GB
display mode      : 1280x1024, 32 bit
process id        : $21f8
allocated memory  : 9,15 MB
executable        : heidisql.exe
exec. date/time   : 2012-01-26 09:57
version           : 6.0.0.4034
compiled with     : Delphi XE
madExcept version : 3.0m beta 1
callstack crc     : $00000000, $2bde04d0, $2bde04d0
exception number  : 1
exception class   : EAccessViolation
exception message : Access violation at address 00000000. Read of address 00000000.
thread $2b14 (TQueryThread):
00000000 ???
0293bf88 libmysql.dll                       mysql_store_result
007118e8 heidisql.exe dbconnection 1272 +32 TMySQLConnection.Query
00680ca9 heidisql.exe helpers      2735 +41 TQueryThread.Execute
00407358 heidisql.exe System        548  +0 ThreadWrapper
00460491 heidisql.exe madExcept             CallThreadProcSafe
004604fb heidisql.exe madExcept             ThreadExceptFrame
>> created by main thread ($2210) at:
006809fa heidisql.exe helpers      2670  +1 TQueryThread.Create
main thread ($2210):
00000000 heidisql.exe madStackTrace +0 StackAddrToStr
>> stack will be calculated soon