Server crashes when wsrep_sst_donor and wsrep_cluster_address set to NULL

SET @@global.wsrep_sst_donor = NULL;

SET @@global.wsrep_cluster_address='NULL';

Core was generated by `/test/GAL_MD270422-mariadb-10.9.0-linux-x86_64-opt/bin/mysqld --defaults-file=/'.

Program terminated with signal SIGABRT, Aborted.

#0  __pthread_kill (threadid=<optimized out>, signo=signo@entry=6)

    at ../sysdeps/unix/sysv/linux/pthread_kill.c:56

[Current thread is 1 (Thread 0x14ddec0a4700 (LWP 196251))]

(gdb) bt

#0  __pthread_kill (threadid=<optimized out>, signo=signo@entry=6) at ../sysdeps/unix/sysv/linux/pthread_kill.c:56

#1  0x0000564623802dff in my_write_core (sig=sig@entry=6) at /test/10.9_opt/mysys/stacktrace.c:424

#2  0x00005646232ad3e0 in handle_fatal_signal (sig=6) at /test/10.9_opt/sql/signal_handler.cc:345

#3  <signal handler called>

#4  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50

#5  0x000014ddfeb52859 in __GI_abort () at abort.c:79

#6  0x000014ddfef0c911 in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6

#7  0x000014ddfef1838c in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6

#8  0x000014ddfef183f7 in std::terminate() () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6

#9  0x000014ddfef186a9 in __cxa_throw () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6

#10 0x000014ddfef0f21e in std::__throw_logic_error(char const*) () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6

#11 0x0000564623571efe in std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_construct<char const*> (__end=0xffffffffffffffff <error: Cannot access memory at address 0xffffffffffffffff>, __beg=0x0, this=0x14ddec0a2d70) at /usr/include/c++/9/bits/basic_string.tcc:206

#12 std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_construct_aux<char const*> (__end=0xffffffffffffffff <error: Cannot access memory at address 0xffffffffffffffff>, __beg=0x0, this=0x14ddec0a2d70) at /usr/include/c++/9/bits/basic_string.h:247

#13 std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_construct<char const*> (__end=0xffffffffffffffff <error: Cannot access memory at address 0xffffffffffffffff>, __beg=0x0, this=0x14ddec0a2d70) at /usr/include/c++/9/bits/basic_string.h:266

#14 std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string (__a=<optimized out>, __s=0x0, this=0x14ddec0a2d70) at /usr/include/c++/9/bits/basic_string.h:527

#15 wsrep_start_replication (wsrep_cluster_address=<optimized out>, wsrep_cluster_address@entry=0x14dd88016928 "NULL") at /test/10.9_opt/sql/wsrep_mysqld.cc:1166

#16 0x0000564623582a20 in wsrep_cluster_address_update (self=<optimized out>, thd=0x14dd88000c58, type=<optimized out>) at /test/10.9_opt/sql/wsrep_var.cc:679

#17 0x0000564622f9953a in sys_var::update (this=0x5646241180e0 <Sys_wsrep_cluster_address>, thd=0x14dd88000c58, var=0x14dd88010a20) at /test/10.9_opt/include/mysql/psi/mysql_thread.h:795

#18 0x0000564622f999bb in set_var::update (this=<optimized out>, thd=<optimized out>) at /test/10.9_opt/sql/set_var.cc:863

#19 0x0000564622f9ab49 in sql_set_variables (thd=thd@entry=0x14dd88000c58, var_list=var_list@entry=0x14dd88005db8, free=free@entry=true) at /test/10.9_opt/sql/set_var.cc:745

#20 0x00005646230663a0 in mysql_execute_command (thd=0x14dd88000c58, is_called_from_prepared_stmt=<optimized out>) at /test/10.9_opt/sql/sql_parse.cc:5049

#21 0x0000564623055067 in mysql_parse (thd=0x14dd88000c58, rawbuf=<optimized out>, length=<optimized out>, parser_state=<optimized out>) at /test/10.9_opt/sql/sql_parse.cc:8043

#22 0x0000564623054821 in wsrep_mysql_parse (thd=0x14dd88000c58, rawbuf=0x14dd880108c0 "SET @@global.wsrep_cluster_address='NULL'", length=41, parser_state=0x14ddec0a3440) at /test/10.9_opt/sql/sql_parse.cc:7856

#23 0x0000564623062b4a in dispatch_command (command=COM_QUERY, thd=0x14dd88000c58, packet=0x14dd88008599 "SET @@global.wsrep_cluster_address='NULL'", packet_length=<optimized out>, blocking=<optimized out>) at /test/10.9_opt/sql/sql_class.h:1364

#24 0x0000564623063668 in do_command (thd=0x14dd88000c58, blocking=blocking@entry=true) at /test/10.9_opt/sql/sql_parse.cc:1407

#25 0x00005646231841d7 in do_handle_one_connection (connect=<optimized out>, put_in_cache=true) at /test/10.9_opt/sql/sql_connect.cc:1418

#26 0x000056462318452d in handle_one_connection (arg=arg@entry=0x5646268811f8) at /test/10.9_opt/sql/sql_connect.cc:1312

#27 0x00005646234ff7f6 in pfs_spawn_thread (arg=0x5646268938d8) at /test/10.9_opt/storage/perfschema/pfs.cc:2201

#28 0x000014ddff061609 in start_thread (arg=<optimized out>) at pthread_create.c:477

#29 0x000014ddfec4f293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95