Assertion `src != ((void *)0)' failed in my_casedn_8bit

SET NAMES latin1;

SELECT  lcase((extractvalue('a', 'a'))) a FROM (select 1) dt;

SELECT  ucase((extractvalue('a', 'a'))) a FROM (select 1) dt;

Server version: 11.4.6-MariaDB-debug-log source revision: c6de1267dda77d78f843b26b4dafe0bc0473f7d5

strings/ctype-simple.c:270(my_casedn_8bit)[0x55ee09d5dab9]

sql/item_strfunc.cc:2001(Item_str_conv::val_str(String*))[0x55ee08896452]

sql/sql_type.cc:7680(Type_handler::Item_send_str(Item*, Protocol*, st_value*) const)[0x55ee08424948]

sql/sql_type.h:5611(Type_handler_string_result::Item_send(Item*, Protocol*, st_value*) const)[0x55ee0817c6c4]

sql/item.h:1262(Item::send(Protocol*, st_value*))[0x55ee078fee84]

sql/protocol.cc:1333(Protocol::send_result_set_row(List<Item>*))[0x55ee079d66c6]

sql/sql_class.cc:3264(select_send::send_data(List<Item>&))[0x55ee07b86d12]

sql/sql_class.h:6099(select_result_sink::send_data_with_check(List<Item>&, st_select_lex_unit*, unsigned long long))[0x55ee07eda915]

sql/sql_select.cc:25543(end_send(JOIN*, st_join_table*, bool))[0x55ee07e8ec53]

sql/sql_select.cc:23676(do_select(JOIN*, Procedure*))[0x55ee07e8211c]

sql/sql_select.cc:5052(JOIN::exec_inner())[0x55ee07dfbd8a]

sql/sql_select.cc:4838(JOIN::exec())[0x55ee07df9176]

sql/sql_select.cc:5368(mysql_select(THD*, TABLE_LIST*, List<Item>&, Item*, unsigned int, st_order*, st_order*, Item*, st_order*, unsigned long long, select_result*, st_select_lex_unit*, st_select_lex*))[0x55ee07dfd9c0]

sql/sql_select.cc:642(handle_select(THD*, LEX*, select_result*, unsigned long long))[0x55ee07dcb166]

sql/sql_parse.cc:6183(execute_sqlcom_select(THD*, TABLE_LIST*))[0x55ee07ce5c69]

sql/sql_parse.cc:3975(mysql_execute_command(THD*, bool))[0x55ee07cd59b5]

sql/sql_parse.cc:7907(mysql_parse(THD*, char*, unsigned int, Parser_state*))[0x55ee07cf0cda]

sql/sql_parse.cc:1906(dispatch_command(enum_server_command, THD*, char*, unsigned int, bool))[0x55ee07cc732a]

sql/sql_parse.cc:1417(do_command(THD*, bool))[0x55ee07cc3ff1]

sql/sql_connect.cc:1408(do_handle_one_connection(CONNECT*, bool))[0x55ee081c66b5]

sql/sql_connect.cc:1322(handle_one_connection)[0x55ee081c6208]

perfschema/pfs.cc:2203(pfs_spawn_thread)[0x55ee08eb191c]

nptl/pthread_create.c:478(start_thread)[0x7f9376c4e609]

Query (0x62d0003704a8): SELECT  lcase((extractvalue('1939-09-1', 'a'))) a FROM (select 1) dt