json_arrayagg crashes in Item_func_group_concat::add, Assertion `(ptr != __null && end >= ptr) || (ptr == __null && end == __null)' failed in copy_fields

Thread 20 "mysqld" received signal SIGSEGV, Segmentation fault.

[Switching to Thread 0x7ffff44af700 (LWP 21758)]

in Item_func_group_concat::add at ./sql/item_sum.cc:4019

4019	in ./sql/item_sum.cc

(gdb) bt

#0  in Item_func_group_concat::add at ./sql/item_sum.cc:4019

#1  in Item_sum::aggregator_add at ./sql/item_sum.h:559

#2  in Item_sum::reset_and_add at ./sql/item_sum.h:444

#3  in init_sum_functions at ./sql/sql_select.cc:25309

#4  in end_send_group at ./sql/sql_select.cc:21689

#5  in do_select at ./sql/sql_select.cc:19789

#6  in JOIN::exec_inner at ./sql/sql_select.cc:4391

#7  in JOIN::exec at ./sql/sql_select.cc:4172

#8  in mysql_select at ./sql/sql_select.cc:4596

#9  in handle_select at ./sql/sql_select.cc:428

#10 in execute_sqlcom_select at ./sql/sql_parse.cc:6217

#11 in mysql_execute_command at ./sql/sql_parse.cc:3905

#12 in mysql_parse at ./sql/sql_parse.cc:7986

#13 in dispatch_command at ./sql/sql_parse.cc:1846

#14 in do_command at ./sql/sql_parse.cc:1364

#15 in do_handle_one_connection at ./sql/sql_connect.cc:1422

#16 in handle_one_connection at ./sql/sql_connect.cc:1319

#17 in start_thread at pthread_create.c:479