diff --git a/mysql-test/r/select.result b/mysql-test/r/select.result
index 50b5c3c13fb..a41f95de077 100644
--- a/mysql-test/r/select.result
+++ b/mysql-test/r/select.result
@@ -4386,6 +4386,35 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 Warnings:
 Note	1003	select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` where ((`test`.`t1`.`a` = `test`.`t1`.`b`) and (`test`.`t1`.`a` > 1)) limit 2
 DROP TABLE t1;
+#
+# Bug#47019: Assertion failed: 0, file .\rt_mbr.c, line 138 when 
+# forcing a spatial index
+#
+CREATE TABLE t1(a LINESTRING NOT NULL, SPATIAL KEY(a));
+INSERT INTO t1 VALUES
+(GEOMFROMTEXT('LINESTRING(-1 -1, 1 -1, -1 -1, -1 1, 1 1)')),
+(GEOMFROMTEXT('LINESTRING(-1 -1, 1 -1, -1 -1, -1 1, 1 1)'));
+EXPLAIN SELECT 1 FROM t1 NATURAL LEFT JOIN t1 AS t2;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	2	
+1	SIMPLE	t2	ALL	a	NULL	NULL	NULL	2	
+SELECT 1 FROM t1 NATURAL LEFT JOIN t1 AS t2;
+1
+1
+1
+1
+1
+EXPLAIN SELECT 1 FROM t1 NATURAL LEFT JOIN t1 AS t2 FORCE INDEX(a);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	2	
+1	SIMPLE	t2	ALL	a	NULL	NULL	NULL	2	
+SELECT 1 FROM t1 NATURAL LEFT JOIN t1 AS t2 FORCE INDEX(a);
+1
+1
+1
+1
+1
+DROP TABLE t1;
 End of 5.0 tests
 create table t1(a INT, KEY (a));
 INSERT INTO t1 VALUES (1),(2),(3),(4),(5);
diff --git a/mysql-test/t/select.test b/mysql-test/t/select.test
index 7d3785ecccc..1e7e853da32 100644
--- a/mysql-test/t/select.test
+++ b/mysql-test/t/select.test
@@ -3739,6 +3739,22 @@ EXPLAIN EXTENDED SELECT a, b FROM t1 WHERE a > 1 AND a = b LIMIT 2;
 EXPLAIN EXTENDED SELECT a, b FROM t1 WHERE a > 1 AND b = a LIMIT 2;
 
 DROP TABLE t1;
+
+
+--echo #
+--echo # Bug#47019: Assertion failed: 0, file .\rt_mbr.c, line 138 when 
+--echo # forcing a spatial index
+--echo #
+CREATE TABLE t1(a LINESTRING NOT NULL, SPATIAL KEY(a));
+INSERT INTO t1 VALUES
+  (GEOMFROMTEXT('LINESTRING(-1 -1, 1 -1, -1 -1, -1 1, 1 1)')),
+  (GEOMFROMTEXT('LINESTRING(-1 -1, 1 -1, -1 -1, -1 1, 1 1)'));
+EXPLAIN SELECT 1 FROM t1 NATURAL LEFT JOIN t1 AS t2;
+SELECT 1 FROM t1 NATURAL LEFT JOIN t1 AS t2;
+EXPLAIN SELECT 1 FROM t1 NATURAL LEFT JOIN t1 AS t2 FORCE INDEX(a);
+SELECT 1 FROM t1 NATURAL LEFT JOIN t1 AS t2 FORCE INDEX(a);
+DROP TABLE t1;
+
  
 --echo End of 5.0 tests
 
diff --git a/sql/sql_select.cc b/sql/sql_select.cc
index c5e0bce498d..cd4fe5d494a 100644
--- a/sql/sql_select.cc
+++ b/sql/sql_select.cc
@@ -3560,7 +3560,7 @@ add_key_part(DYNAMIC_ARRAY *keyuse_array,KEY_FIELD *key_field)
     {
       if (!(form->keys_in_use_for_query.is_set(key)))
 	continue;
-      if (form->key_info[key].flags & HA_FULLTEXT)
+      if (form->key_info[key].flags & (HA_FULLTEXT | HA_SPATIAL))
 	continue;    // ToDo: ft-keys in non-ft queries.   SerG
 
       uint key_parts= (uint) form->key_info[key].key_parts;