Crash: Access violation at address

Occurs after leaving the application running for a while, then running any query

date/time          : 2020-04-21, 18:25:16, 383ms
computer name      : EMSLT9PM28Y2
user name          : P10142513
registered owner   : Windows User / CAPITA
operating system   : Windows 10 x64 build 17763
system language    : English
system up time     : 1 day 10 hours
program up time    : 1 hour 54 minutes
processors         : 12x Intel(R) Core(TM) i7-8750H CPU @ 2.20GHz
physical memory    : 17952/32560 MB (free/total)
free disk space    : (C:) 179.59 GB
display mode       : 2560x1440, 32 bit
process id         : $6bc0
allocated memory   : 181.76 MB
largest free block : 131025.95 GB
executable         : heidisql.exe
exec. date/time    : 2019-12-11 11:26
version            : 10.3.0.5771
compiled with      : Delphi 10.3 Rio
madExcept version  : 5.0.0
callstack crc      : $8ae56f81, $a1a610ce, $a1a610ce
exception number   : 1
exception class    : EAccessViolation
exception message  : Access violation at address 000000000047AFA2 in module 'heidisql.exe'. Read of address FFFFFFFFFFFFFFFF.

main thread ($5720):
0047afa2 heidisql.exe System.SysUtils           WideFormatBuf
00479a80 heidisql.exe System.SysUtils           FormatBuf
00479cd9 heidisql.exe System.SysUtils           FmtStr
00479c05 heidisql.exe System.SysUtils           Format
00479bd7 heidisql.exe System.SysUtils           Format
009cdf9e heidisql.exe apphelpers       2689  +2 f_
00dfe072 heidisql.exe Main            13209  +2 TQueryTab.MemofileModifiedTimerNotify
00788b80 heidisql.exe Vcl.ExtCtrls              TTimer.Timer
007889a8 heidisql.exe Vcl.ExtCtrls              TTimer.WndProc
0055e643 heidisql.exe System.Classes            StdWndProc
7fffa27a USER32.dll                             DispatchMessageW
00851fae heidisql.exe Vcl.Forms                 TApplication.ProcessMessage
00852023 heidisql.exe Vcl.Forms                 TApplication.HandleMessage
00852471 heidisql.exe Vcl.Forms                 TApplication.Run
00e08f41 heidisql.exe heidisql           93 +32 initialization
7fffa26e KERNEL32.DLL                           BaseThreadInitThunk
7fffa29c ntdll.dll                              RtlUserThreadStart