diff --git a/mysql-test/r/group_by.result b/mysql-test/r/group_by.result
index 820a828d604..ba3fa7bb083 100644
--- a/mysql-test/r/group_by.result
+++ b/mysql-test/r/group_by.result
@@ -1940,4 +1940,248 @@ Warning	1292	Truncated incorrect INTEGER value: 'K'
 Warning	1292	Truncated incorrect INTEGER value: 'jxW<'
 DROP TABLE t1;
 SET SQL_BIG_TABLES=0;
+#
+# MDEV-641 LP:1002108 - Wrong result (or crash) from a query with duplicated field in the group list and a limit clause
+# Bug#11761078: 53534: INCORRECT 'SELECT SQL_BIG_RESULT...' 
+#               WITH GROUP BY ON DUPLICATED FIELDS
+#
+CREATE TABLE t1(
+col1 int, 
+UNIQUE INDEX idx (col1));
+INSERT INTO t1 VALUES (1),(2),(3),(4),(5),(6),(7),(8),(9),(10),
+(11),(12),(13),(14),(15),(16),(17),(18),(19),(20);
+EXPLAIN SELECT col1 AS field1, col1 AS field2
+FROM t1 GROUP BY field1, field2;;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index	NULL	idx	5	NULL	20	Using index; Using temporary; Using filesort
+FLUSH STATUS;
+SELECT col1 AS field1, col1 AS field2
+FROM t1 GROUP BY field1, field2;;
+field1	field2
+1	1
+2	2
+3	3
+4	4
+5	5
+6	6
+7	7
+8	8
+9	9
+10	10
+11	11
+12	12
+13	13
+14	14
+15	15
+16	16
+17	17
+18	18
+19	19
+20	20
+SHOW SESSION STATUS LIKE 'Sort_scan%';
+Variable_name	Value
+Sort_scan	1
+EXPLAIN SELECT SQL_BIG_RESULT col1 AS field1, col1 AS field2
+FROM t1 GROUP BY field1, field2;;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index	NULL	idx	5	NULL	20	Using index; Using filesort
+FLUSH STATUS;
+SELECT SQL_BIG_RESULT col1 AS field1, col1 AS field2
+FROM t1 GROUP BY field1, field2;;
+field1	field2
+1	1
+2	2
+3	3
+4	4
+5	5
+6	6
+7	7
+8	8
+9	9
+10	10
+11	11
+12	12
+13	13
+14	14
+15	15
+16	16
+17	17
+18	18
+19	19
+20	20
+SHOW SESSION STATUS LIKE 'Sort_scan%';
+Variable_name	Value
+Sort_scan	1
+CREATE VIEW v1 AS SELECT * FROM t1;
+SELECT SQL_BIG_RESULT col1 AS field1, col1 AS field2
+FROM v1 
+GROUP BY field1, field2;
+field1	field2
+1	1
+2	2
+3	3
+4	4
+5	5
+6	6
+7	7
+8	8
+9	9
+10	10
+11	11
+12	12
+13	13
+14	14
+15	15
+16	16
+17	17
+18	18
+19	19
+20	20
+SELECT SQL_BIG_RESULT tbl1.col1 AS field1, tbl2.col1 AS field2
+FROM t1 as tbl1, t1 as tbl2 
+GROUP BY field1, field2 
+LIMIT 3;
+field1	field2
+1	1
+1	2
+1	3
+explain
+select col1 f1, col1 f2 from t1 order by f2, f1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index	NULL	idx	5	NULL	20	Using index; Using filesort
+select col1 f1, col1 f2 from t1 order by f2, f1;
+f1	f2
+1	1
+2	2
+3	3
+4	4
+5	5
+6	6
+7	7
+8	8
+9	9
+10	10
+11	11
+12	12
+13	13
+14	14
+15	15
+16	16
+17	17
+18	18
+19	19
+20	20
+explain
+select col1 f1, col1 f2 from t1 group by f2 order by f2, f1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	range	NULL	idx	5	NULL	7	Using index for group-by; Using temporary; Using filesort
+select col1 f1, col1 f2 from t1 group by f2 order by f2, f1;
+f1	f2
+1	1
+2	2
+3	3
+4	4
+5	5
+6	6
+7	7
+8	8
+9	9
+10	10
+11	11
+12	12
+13	13
+14	14
+15	15
+16	16
+17	17
+18	18
+19	19
+20	20
+explain
+select col1 f1, col1 f2 from t1 group by f1, f2 order by f2, f1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index	NULL	idx	5	NULL	20	Using index; Using temporary; Using filesort
+select col1 f1, col1 f2 from t1 group by f1, f2 order by f2, f1;
+f1	f2
+1	1
+2	2
+3	3
+4	4
+5	5
+6	6
+7	7
+8	8
+9	9
+10	10
+11	11
+12	12
+13	13
+14	14
+15	15
+16	16
+17	17
+18	18
+19	19
+20	20
+CREATE TABLE t2(
+col1 int, 
+col2 int, 
+UNIQUE INDEX idx (col1, col2));
+INSERT INTO t2(col1, col2) VALUES
+(1,20),(2,19),(3,18),(4,17),(5,16),(6,15),(7,14),(8,13),(9,12),(10,11),
+(11,10),(12,9),(13,8),(14,7),(15,6),(16,5),(17,4),(18,3),(19,2),(20,1);
+explain
+select col1 f1, col2 f2, col1 f3 from t2 group by f1, f2, f3;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	index	NULL	idx	10	NULL	20	Using index; Using temporary; Using filesort
+select col1 f1, col2 f2, col1 f3 from t2 group by f1, f2, f3;
+f1	f2	f3
+1	20	1
+2	19	2
+3	18	3
+4	17	4
+5	16	5
+6	15	6
+7	14	7
+8	13	8
+9	12	9
+10	11	10
+11	10	11
+12	9	12
+13	8	13
+14	7	14
+15	6	15
+16	5	16
+17	4	17
+18	3	18
+19	2	19
+20	1	20
+explain
+select col1 f1, col2 f2, col1 f3 from t2 order by f1, f2, f3;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	index	NULL	idx	10	NULL	20	Using index; Using filesort
+select col1 f1, col2 f2, col1 f3 from t2 order by f1, f2, f3;
+f1	f2	f3
+1	20	1
+2	19	2
+3	18	3
+4	17	4
+5	16	5
+6	15	6
+7	14	7
+8	13	8
+9	12	9
+10	11	10
+11	10	11
+12	9	12
+13	8	13
+14	7	14
+15	6	15
+16	5	16
+17	4	17
+18	3	18
+19	2	19
+20	1	20
+DROP VIEW v1;
+DROP TABLE t1, t2;
 # End of 5.1 tests
diff --git a/mysql-test/t/group_by.test b/mysql-test/t/group_by.test
index 8f38f0e9fd9..d9ec637b012 100644
--- a/mysql-test/t/group_by.test
+++ b/mysql-test/t/group_by.test
@@ -1315,4 +1315,78 @@ SELECT 1 FROM t1 GROUP BY SUBSTRING(SYSDATE() FROM 'K' FOR 'jxW<');
 DROP TABLE t1;
 SET SQL_BIG_TABLES=0;
 
+--echo #
+--echo # MDEV-641 LP:1002108 - Wrong result (or crash) from a query with duplicated field in the group list and a limit clause
+--echo # Bug#11761078: 53534: INCORRECT 'SELECT SQL_BIG_RESULT...' 
+--echo #               WITH GROUP BY ON DUPLICATED FIELDS
+--echo #
+
+CREATE TABLE t1(
+ col1 int, 
+ UNIQUE INDEX idx (col1));
+
+INSERT INTO t1 VALUES (1),(2),(3),(4),(5),(6),(7),(8),(9),(10),
+   (11),(12),(13),(14),(15),(16),(17),(18),(19),(20);
+
+let $query0=SELECT col1 AS field1, col1 AS field2
+            FROM t1 GROUP BY field1, field2;
+
+# Needs to be range to exercise bug
+--eval EXPLAIN $query0;
+FLUSH STATUS;
+--eval $query0;
+SHOW SESSION STATUS LIKE 'Sort_scan%';
+
+let $query=SELECT SQL_BIG_RESULT col1 AS field1, col1 AS field2
+           FROM t1 GROUP BY field1, field2;
+
+# Needs to be range to exercise bug
+--eval EXPLAIN $query;
+FLUSH STATUS;
+--eval $query;
+SHOW SESSION STATUS LIKE 'Sort_scan%';
+
+CREATE VIEW v1 AS SELECT * FROM t1;
+
+SELECT SQL_BIG_RESULT col1 AS field1, col1 AS field2
+FROM v1 
+GROUP BY field1, field2; 
+
+SELECT SQL_BIG_RESULT tbl1.col1 AS field1, tbl2.col1 AS field2
+FROM t1 as tbl1, t1 as tbl2 
+GROUP BY field1, field2 
+LIMIT 3;
+
+explain
+select col1 f1, col1 f2 from t1 order by f2, f1;
+select col1 f1, col1 f2 from t1 order by f2, f1;
+
+explain
+select col1 f1, col1 f2 from t1 group by f2 order by f2, f1;
+select col1 f1, col1 f2 from t1 group by f2 order by f2, f1;
+
+explain
+select col1 f1, col1 f2 from t1 group by f1, f2 order by f2, f1;
+select col1 f1, col1 f2 from t1 group by f1, f2 order by f2, f1;
+
+CREATE TABLE t2(
+ col1 int, 
+ col2 int, 
+ UNIQUE INDEX idx (col1, col2));
+
+INSERT INTO t2(col1, col2) VALUES
+   (1,20),(2,19),(3,18),(4,17),(5,16),(6,15),(7,14),(8,13),(9,12),(10,11),
+   (11,10),(12,9),(13,8),(14,7),(15,6),(16,5),(17,4),(18,3),(19,2),(20,1);
+
+explain
+select col1 f1, col2 f2, col1 f3 from t2 group by f1, f2, f3;
+select col1 f1, col2 f2, col1 f3 from t2 group by f1, f2, f3;
+
+explain
+select col1 f1, col2 f2, col1 f3 from t2 order by f1, f2, f3;
+select col1 f1, col2 f2, col1 f3 from t2 order by f1, f2, f3;
+
+DROP VIEW v1;
+DROP TABLE t1, t2;
+
 --echo # End of 5.1 tests
diff --git a/sql/opt_range.cc b/sql/opt_range.cc
index 14c2eeddb9f..89495e57e93 100644
--- a/sql/opt_range.cc
+++ b/sql/opt_range.cc
@@ -9481,6 +9481,13 @@ get_best_group_min_max(PARAM *param, SEL_TREE *tree)
         else
           goto next_index;
       }
+      /*
+        This function is called on the precondition that the index is covering.
+        Therefore if the GROUP BY list contains more elements than the index,
+        these are duplicates. The GROUP BY list cannot be a prefix of the index.
+      */
+      if (cur_part == end_part && tmp_group)
+        goto next_index;
     }
     /*
       Check (GA2) if this is a DISTINCT query.