Error in sql syntax

when i tried to add this to the db it shows this => You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')' at line 5. I dont know what is my error.

Here is my codes

The author has been inserted successfully!";

$message .= "Name:
" . $author_name . "

";

$message .= "Gender:
" . $gender_id . "

";

$message .= "Add Another Item";

} else {

$message .= "Error occurs in inserting item record.

Try Again";

}

?>

#container1 {

background-color: #e2dada;

opacity: 0.9;

border-radius: 2em;

}

.centered-form {

margin-top: 120px;

margin-bottom: 120px;

}

.centered-form .panel {

background: rgba(255, 255, 255, 0.8);

box-shadow: rgba(0, 0, 0, 0.3) 20px 20px 20px;

}