Assertion `! is_set()' failed in Diagnostics_area::set_eof_status on EXPLAIN INSERT ... UNION

10.0/sql/sql_error.cc:407: void Diagnostics_area::set_eof_status(THD*): Assertion `! is_set()' failed.

150616 14:48:17 [ERROR] mysqld got signal 6 ;

#6  0x00007fa8a01c6311 in *__GI___assert_fail (assertion=0xf06ca7 "! is_set()", file=<optimized out>, line=407, function=0xf07a60 "void Diagnostics_area::set_eof_status(THD*)") at assert.c:81

#7  0x0000000000659342 in Diagnostics_area::set_eof_status (this=0x7fa89b7d8d28, thd=0x7fa89b7d4070) at 10.0/sql/sql_error.cc:407

#8  0x00000000005da825 in my_eof (thd=0x7fa89b7d4070) at 10.0/sql/sql_class.h:3816

#9  0x0000000000643f8b in select_send::send_eof (this=0x7fa898aad320) at 10.0/sql/sql_class.cc:2582

#10 0x00000000007cbc2b in Explain_query::send_explain (this=0x7fa898b4af80, thd=0x7fa89b7d4070) at 10.0/sql/sql_explain.cc:147

#11 0x000000000068055a in mysql_execute_command (thd=0x7fa89b7d4070) at 10.0/sql/sql_parse.cc:3556

#12 0x00000000006885a3 in mysql_parse (thd=0x7fa89b7d4070, rawbuf=0x7fa8988e0088 "EXPLAIN INSERT INTO t1 SELECT * FROM t2 UNION SELECT * FROM t3", length=62, parser_state=0x7fa8a23cf600) at 10.0/sql/sql_parse.cc:6529

#13 0x000000000067af8f in dispatch_command (command=COM_QUERY, thd=0x7fa89b7d4070, packet=0x7fa89b7ca071 "", packet_length=62) at 10.0/sql/sql_parse.cc:1308

#14 0x000000000067a275 in do_command (thd=0x7fa89b7d4070) at 10.0/sql/sql_parse.cc:999

#15 0x000000000079826e in do_handle_one_connection (thd_arg=0x7fa89b7d4070) at 10.0/sql/sql_connect.cc:1378

#16 0x0000000000797fcd in handle_one_connection (arg=0x7fa89b7d4070) at 10.0/sql/sql_connect.cc:1293

#17 0x0000000000cd7843 in pfs_spawn_thread (arg=0x7fa89a184370) at 10.0/storage/perfschema/pfs.cc:1860

#18 0x00007fa8a1fc0b50 in start_thread (arg=<optimized out>) at pthread_create.c:304

#19 0x00007fa8a027695d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112

CREATE TABLE t1 (a INT);

CREATE TABLE t2 (b INT);

CREATE TABLE t3 (c INT);

# Data is not necessary, tables can be empty as well

INSERT INTO t1 VALUES (1),(2);

INSERT INTO t2 VALUES (3),(4);

INSERT INTO t3 VALUES (5),(6);

EXPLAIN INSERT INTO t1 SELECT * FROM t2 UNION SELECT * FROM t3;