Server crashes when executing SQL on a system table with wrong structure

CREATE OR REPLACE TABLE mysql.servers ( c0 BLOB NOT NULL,INDEX (c0) );

CREATE SERVER s1 FOREIGN DATA WRAPPER foo OPTIONS(USER 'a');

Core was generated by `/test/MD200324-mariadb-11.5.0-linux-x86_64-opt/bin/mariadbd --no-defaults --max'.

Program terminated with signal SIGSEGV, Segmentation fault.

#0  0x0000557824887a13 in store_server_fields (

    table=table@entry=0x557827b5a2d8, server=server@entry=0x1481e004a5a0)

    at /test/server_opt/sql/sql_servers.cc:572

[Current thread is 1 (Thread 0x148214129700 (LWP 3496106))]

(gdb) bt

#0  0x0000557824887a13 in store_server_fields (table=table@entry=0x557827b5a2d8, server=server@entry=0x1481e004a5a0) at /test/server_opt/sql/sql_servers.cc:572

#1  0x0000557824888625 in insert_server_record (server=0x1481e004a5a0, table=0x557827b5a2d8) at /test/server_opt/sql/sql_servers.cc:650

#2  insert_server (thd=thd@entry=0x1481e0000c58, server=server@entry=0x1481e004a5a0) at /test/server_opt/sql/sql_servers.cc:489

#3  0x0000557824888ca4 in create_server (thd=thd@entry=0x1481e0000c58, server_options=server_options@entry=0x1481e00066a8) at /test/server_opt/sql/sql_servers.cc:1251

#4  0x000055782475da1a in mysql_execute_command (thd=0x1481e0000c58, is_called_from_prepared_stmt=<optimized out>) at /test/server_opt/sql/sql_parse.cc:5738

#5  0x000055782474ae16 in mysql_parse (thd=0x1481e0000c58, rawbuf=<optimized out>, length=<optimized out>, parser_state=<optimized out>) at /test/server_opt/sql/sql_parse.cc:7821

#6  0x00005578247576f5 in dispatch_command (command=COM_QUERY, thd=0x1481e0000c58, packet=<optimized out>, packet_length=<optimized out>, blocking=<optimized out>) at /test/server_opt/sql/sql_class.h:1636

#7  0x0000557824759b4e in do_command (thd=0x1481e0000c58, blocking=blocking@entry=true) at /test/server_opt/sql/sql_parse.cc:1405

#8  0x000055782488c957 in do_handle_one_connection (connect=<optimized out>, put_in_cache=true) at /test/server_opt/sql/sql_connect.cc:1447

#9  0x000055782488cc9d in handle_one_connection (arg=arg@entry=0x557827df8678) at /test/server_opt/sql/sql_connect.cc:1349

#10 0x0000557824c4020c in pfs_spawn_thread (arg=0x557827e1de08) at /test/server_opt/storage/perfschema/pfs.cc:2201

#11 0x0000148229dec609 in start_thread (arg=<optimized out>) at pthread_create.c:477

#12 0x00001482299d8133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

/test/server_opt_san/sql/sql_servers.cc:570:27: runtime error: member call on null pointer of type 'struct Field'

    #0 0x55e5d6b29b1e in store_server_fields /test/server_opt_san/sql/sql_servers.cc:570

    #1 0x55e5d6b30520 in insert_server_record /test/server_opt_san/sql/sql_servers.cc:648

    #2 0x55e5d6b30520 in insert_server /test/server_opt_san/sql/sql_servers.cc:487

    #3 0x55e5d6b31be1 in create_server(THD*, st_lex_server_options*) /test/server_opt_san/sql/sql_servers.cc:1118

    #4 0x55e5d61fe4e0 in mysql_execute_command(THD*, bool) /test/server_opt_san/sql/sql_parse.cc:5732

    #5 0x55e5d61811d0 in mysql_parse(THD*, char*, unsigned int, Parser_state*) /test/server_opt_san/sql/sql_parse.cc:7815

    #6 0x55e5d61d6b00 in dispatch_command(enum_server_command, THD*, char*, unsigned int, bool) /test/server_opt_san/sql/sql_parse.cc:1893

    #7 0x55e5d61e279d in do_command(THD*, bool) /test/server_opt_san/sql/sql_parse.cc:1406

    #8 0x55e5d6b471bd in do_handle_one_connection(CONNECT*, bool) /test/server_opt_san/sql/sql_connect.cc:1437

    #9 0x55e5d6b4982c in handle_one_connection /test/server_opt_san/sql/sql_connect.cc:1339

    #10 0x14f53df45608 in start_thread /build/glibc-SzIz7B/glibc-2.31/nptl/pthread_create.c:477

    #11 0x14f53d1ba132 in __clone (/lib/x86_64-linux-gnu/libc.so.6+0x11f132)