diff --git a/mysql-test/r/ndb_charset.result b/mysql-test/r/ndb_charset.result
index 3763e20e59a..ff9ce7ee1a4 100644
--- a/mysql-test/r/ndb_charset.result
+++ b/mysql-test/r/ndb_charset.result
@@ -112,9 +112,9 @@ unique key(a)
 ) engine=ndb;
 insert into t1 values(1, 'aAa');
 insert into t1 values(2, 'aaa');
-ERROR 23000: Duplicate entry '2' for key 1
+ERROR 23000: Duplicate entry '' for key 0
 insert into t1 values(3, 'AAA');
-ERROR 23000: Duplicate entry '3' for key 1
+ERROR 23000: Duplicate entry '' for key 0
 select * from t1 order by p;
 p	a
 1	aAa
diff --git a/mysql-test/r/ndb_index_unique.result b/mysql-test/r/ndb_index_unique.result
index 7864a5d1354..f2bb5e4ad53 100644
--- a/mysql-test/r/ndb_index_unique.result
+++ b/mysql-test/r/ndb_index_unique.result
@@ -22,7 +22,7 @@ select * from t1 where b = 4 order by a;
 a	b	c
 3	4	6
 insert into t1 values(8, 2, 3);
-ERROR 23000: Duplicate entry '8' for key 1
+ERROR 23000: Duplicate entry '' for key 0
 select * from t1 order by a;
 a	b	c
 1	2	3
@@ -89,7 +89,7 @@ a	b	c
 1	1	1
 4	4	NULL
 insert into t1 values(5,1,1);
-ERROR 23000: Duplicate entry '5' for key 1
+ERROR 23000: Duplicate entry '' for key 0
 drop table t1;
 CREATE TABLE t2 (
 a int unsigned NOT NULL PRIMARY KEY,
@@ -112,7 +112,7 @@ select * from t2 where b = 4 order by a;
 a	b	c
 3	4	6
 insert into t2 values(8, 2, 3);
-ERROR 23000: Duplicate entry '8' for key 1
+ERROR 23000: Duplicate entry '' for key 0
 select * from t2 order by a;
 a	b	c
 1	2	3
@@ -177,7 +177,7 @@ pk	a
 3	NULL
 4	4
 insert into t1 values (5,0);
-ERROR 23000: Duplicate entry '5' for key 1
+ERROR 23000: Duplicate entry '' for key 0
 select * from t1 order by pk;
 pk	a
 -1	NULL
@@ -210,7 +210,7 @@ pk	a	b	c
 0	NULL	18	NULL
 1	3	19	abc
 insert into t2 values(2,3,19,'abc');
-ERROR 23000: Duplicate entry '2' for key 1
+ERROR 23000: Duplicate entry '' for key 0
 select * from t2 order by pk;
 pk	a	b	c
 -1	1	17	NULL
diff --git a/mysql-test/r/ndb_update.result b/mysql-test/r/ndb_update.result
index c2247564e65..164d1bd700c 100644
--- a/mysql-test/r/ndb_update.result
+++ b/mysql-test/r/ndb_update.result
@@ -18,7 +18,7 @@ pk1	b	c
 2	2	2
 4	1	1
 UPDATE t1 set pk1 = 1, c = 2 where pk1 = 4;
-ERROR 23000: Duplicate entry '1' for key 1
+ERROR 23000: Duplicate entry '' for key 0
 select * from t1 order by pk1;
 pk1	b	c
 0	0	0
diff --git a/sql/ha_ndbcluster.cc b/sql/ha_ndbcluster.cc
index 5a9d1e50fd7..f41e47e1b5d 100644
--- a/sql/ha_ndbcluster.cc
+++ b/sql/ha_ndbcluster.cc
@@ -551,7 +551,14 @@ int ha_ndbcluster::ndb_err(NdbTransaction *trans)
   if (res == HA_ERR_FOUND_DUPP_KEY)
   {
     if (m_rows_to_insert == 1)
-      m_dupkey= table->s->primary_key;
+    {
+      /*
+	We can only distinguish between primary and non-primary
+	violations here, so we need to return MAX_KEY for non-primary
+	to signal that key is unknown
+      */
+      m_dupkey= err.code == 630 ? table->s->primary_key : MAX_KEY; 
+    }
     else
     {
       /* We are batching inserts, offending key is not available */
diff --git a/sql/handler.cc b/sql/handler.cc
index 4accc746664..c95102c4bc0 100644
--- a/sql/handler.cc
+++ b/sql/handler.cc
@@ -1774,12 +1774,22 @@ void handler::print_error(int error, myf errflag)
       /* Write the dupplicated key in the error message */
       char key[MAX_KEY_LENGTH];
       String str(key,sizeof(key),system_charset_info);
-      key_unpack(&str,table,(uint) key_nr);
-      uint max_length=MYSQL_ERRMSG_SIZE-(uint) strlen(ER(ER_DUP_ENTRY));
-      if (str.length() >= max_length)
+
+      if (key_nr == MAX_KEY)
       {
-	str.length(max_length-4);
-	str.append(STRING_WITH_LEN("..."));
+	/* Key is unknown */
+	str.length(0);
+	key_nr= -1;
+      }
+      else
+      {
+	key_unpack(&str,table,(uint) key_nr);
+	uint max_length=MYSQL_ERRMSG_SIZE-(uint) strlen(ER(ER_DUP_ENTRY));
+	if (str.length() >= max_length)
+	{
+	    str.length(max_length-4);
+	    str.append(STRING_WITH_LEN("..."));
+	}
       }
       my_error(ER_DUP_ENTRY, MYF(0), str.c_ptr(), key_nr+1);
       DBUG_VOID_RETURN;