I have a piece of PHP code as below:

```
$DB_FIRST_NAME = 'NYC';
$DB_SECOND_NAME = 'SFBAY';
$DB_HOST = 'localhost';
$DB_USER = '***';
$DB_PASS = '***';

$db_connect_first = new mysqli($DB_HOST, $DB_USER, $DB_PASS, $DB_FIRST_NAME);   
$select_query_first = "SELECT field1, field2, field3 FROM names WHERE date > '2014-04-04 00:00:00'";
$query_result_first = $db_connect_first->query($select_query_first);

$db_connect_second = new mysqli($DB_HOST, $DB_USER, $DB_PASS, $DB_SECOND_NAME, true);   
while($row = $query_result_first->fetch_assoc()){
    $field1 = $row['field1'];
    $field2 = $row['field2'];
    $field3 = $row['field3'];
    $insert_query_second = "INSERT INTO hello (firstname, lastname, dob) VALUES ('$field1', '$field2', '$field3')";
    $insert_en_result = $db_connect_second->query($insert_query_second);
}

```

 The `SELECT` query returns 20 rows; however, the `INSERT` query only inserts twelve rows into the `hello` table. I get this error for the queries which are not inserted into the table `mysqli_error() expects parameter 1 to be mysqli, boolean given in...`. Would you please take a look and let me know the problem?

Note: `Select` query has no error, and the code perfectly echos the `$field1`, `$field2` and `$field3` inside the `while` loop. But, `Insert` query not working for all rows.
Also, table structures are similar but they have different field names.

```
  CREATE TABLE IF NOT EXISTS names (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `field1` text NOT NULL,
  `field2` text NOT NULL,
  `field3` text NOT NULL,
  PRIMARY KEY (`id`),
  ) ENGINE=InnoDB  DEFAULT CHARSET=utf8 AUTO_INCREMENT=21 ;

  CREATE TABLE IF NOT EXISTS hello ( 
     id int(11) NOT NULL AUTO_INCREMENT, 
     firstname text CHARACTER SET utf8 COLLATE utf8_unicode_ci,
     lastname text CHARACTER SET utf8 COLLATE utf8_unicode_ci, 
     dob mediumtext CHARACTER SET utf8 COLLATE utf8_unicode_ci, 
     PRIMARY KEY (id) ) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=400 ; 

```

 below is the picture from `Describe hello` query in database.
![enter image description here](https://i.stack.imgur.com/DdwyA.png)
 also, below is the result from `SHOW INDEX FROM hello`
![enter image description here](https://i.stack.imgur.com/43gc1.png)