crash in flush_cached_blocks (Aria)

As below.

> Your assistance in bug reporting will enable us to fix this for the next release.
> To report this bug, see https://mariadb.com/kb/en/reporting-bugs about how to report
> a bug on https://jira.mariadb.org/.
>
> Please include the information from the server start above, to the end of the
> information below.
>
> Server version: 10.11.14-MariaDB-log source revision: 053f9bcb5b147bf00edb99e1310bae9125b7f125
>
> The information page at https://mariadb.com/kb/en/how-to-produce-a-full-stack-trace-for-mariadbd/
> contains instructions to obtain a better version of the backtrace below.
> Following these instructions will help MariaDB developers provide a fix quicker.
>
> Attempting backtrace. Include this in the bug report.
> (note: Retrieving this information may fail)
>
> Thread pointer: 0x0
> server.dll!flush_cached_blocks()[ma_pagecache.c:4807]
> server.dll!flush_pagecache_blocks_int()[ma_pagecache.c:5127]
> server.dll!flush_pagecache_blocks_with_filter()[ma_pagecache.c:5242]
> server.dll!ma_checkpoint_background()[ma_checkpoint.c:691]
> server.dll!pthread_start()[my_winthread.c:62]
> ucrtbase.dll!wcsrchr()
> KERNEL32.DLL!BaseThreadInitThunk()
> ntdll.dll!RtlUserThreadStart()
> Writing a core file at C:\Program Files\MariaDB\data
> Minidump written to C:\Program Files\MariaDB\data\mysqld.dmp