diff --git a/mysql-test/r/insert_select.result b/mysql-test/r/insert_select.result
index 89ac863b8d2..0af48d27cd5 100644
--- a/mysql-test/r/insert_select.result
+++ b/mysql-test/r/insert_select.result
@@ -695,6 +695,16 @@ CREATE TABLE t2 (z int, y int);
 CREATE TABLE t3 (a int, b int);
 INSERT INTO t3 (SELECT x, y FROM t1 JOIN t2 USING (y) WHERE z = 1);
 DROP TABLE IF EXISTS t1,t2,t3;
+CREATE DATABASE bug21774_1;
+CREATE DATABASE bug21774_2;
+CREATE TABLE bug21774_1.t1(id VARCHAR(10) NOT NULL,label VARCHAR(255));
+CREATE TABLE bug21774_2.t1(id VARCHAR(10) NOT NULL,label VARCHAR(255));
+CREATE TABLE bug21774_1.t2(id VARCHAR(10) NOT NULL,label VARCHAR(255));
+INSERT INTO bug21774_2.t1 SELECT t1.* FROM bug21774_1.t1;
+use bug21774_1;
+INSERT INTO bug21774_2.t1 SELECT t1.* FROM t1;
+DROP DATABASE bug21774_1;
+DROP DATABASE bug21774_2;
 CREATE DATABASE meow;
 CREATE TABLE table_target   ( mexs_id CHAR(8), messzeit TIMESTAMP, PRIMARY KEY (mexs_id));
 CREATE TABLE table_target2  ( mexs_id CHAR(8), messzeit TIMESTAMP, PRIMARY KEY (mexs_id));
diff --git a/mysql-test/t/insert_select.test b/mysql-test/t/insert_select.test
index b6b94d07e87..6f86ed897ac 100644
--- a/mysql-test/t/insert_select.test
+++ b/mysql-test/t/insert_select.test
@@ -248,6 +248,24 @@ CREATE TABLE t3 (a int, b int);
 INSERT INTO t3 (SELECT x, y FROM t1 JOIN t2 USING (y) WHERE z = 1);
 DROP TABLE IF EXISTS t1,t2,t3;
 
+#
+# Bug #21774: Column count doesn't match value count at row x
+#
+CREATE DATABASE bug21774_1;
+CREATE DATABASE bug21774_2;
+
+CREATE TABLE bug21774_1.t1(id VARCHAR(10) NOT NULL,label VARCHAR(255));
+CREATE TABLE bug21774_2.t1(id VARCHAR(10) NOT NULL,label VARCHAR(255));
+CREATE TABLE bug21774_1.t2(id VARCHAR(10) NOT NULL,label VARCHAR(255));
+
+INSERT INTO bug21774_2.t1 SELECT t1.* FROM bug21774_1.t1;
+
+use bug21774_1;
+INSERT INTO bug21774_2.t1 SELECT t1.* FROM t1;
+
+DROP DATABASE bug21774_1;
+DROP DATABASE bug21774_2;
+
 #
 # Bug #20989: View '(null).(null)' references invalid table(s)... on
 #             SQL SECURITY INVOKER
diff --git a/sql/sql_base.cc b/sql/sql_base.cc
index 3a12477bc15..c29c610b200 100644
--- a/sql/sql_base.cc
+++ b/sql/sql_base.cc
@@ -4453,7 +4453,20 @@ bool setup_tables(THD *thd, Name_resolution_context *context,
   uint tablenr= 0;
   DBUG_ENTER("setup_tables");
 
-  context->table_list= context->first_name_resolution_table= tables;
+  /*
+    Due to the various call paths that lead to setup_tables() it may happen
+    that context->table_list and context->first_name_resolution_table can be
+    NULL (this is typically done when creating TABLE_LISTs internally).
+    TODO:
+    Investigate all cases when this my happen, initialize the name resolution
+    context correctly in all those places, and remove the context reset below.
+  */
+  if (!context->table_list || !context->first_name_resolution_table)
+  {
+    /* Test whether the context is in a consistent state. */
+    DBUG_ASSERT(!context->first_name_resolution_table && !context->table_list);
+    context->table_list= context->first_name_resolution_table= tables;
+  }
 
   /*
     this is used for INSERT ... SELECT.
diff --git a/sql/sql_insert.cc b/sql/sql_insert.cc
index c08deedea72..b70d11e4b26 100644
--- a/sql/sql_insert.cc
+++ b/sql/sql_insert.cc
@@ -411,6 +411,15 @@ bool mysql_insert(THD *thd,TABLE_LIST *table_list,
   table= table_list->table;
 
   context= &thd->lex->select_lex.context;
+  /*
+    These three asserts test the hypothesis that the resetting of the name
+    resolution context below is not necessary at all since the list of local
+    tables for INSERT always consists of one table.
+  */
+  DBUG_ASSERT(!table_list->next_local);
+  DBUG_ASSERT(!context->table_list->next_local);
+  DBUG_ASSERT(!context->first_name_resolution_table->next_name_resolution_table);
+
   /* Save the state of the current name resolution context. */
   ctx_state.save_state(context, table_list);
 
diff --git a/sql/sql_parse.cc b/sql/sql_parse.cc
index 2acbf18f1e6..0e49eb297f5 100644
--- a/sql/sql_parse.cc
+++ b/sql/sql_parse.cc
@@ -3344,8 +3344,6 @@ end_with_restore_list:
     DBUG_ASSERT(first_table == all_tables && first_table != 0);
     if ((res= insert_precheck(thd, all_tables)))
       break;
-    /* Skip first table, which is the table we are inserting in */
-    select_lex->context.table_list= first_table->next_local;
 
     if (!thd->locked_tables &&
         !(need_start_waiting= !wait_if_global_read_lock(thd, 0, 1)))