php - bind_param what causing the error -

$conn = new mysqli(db_host, db_user, db_password, db_name); if($conn->connect_error) {   $this->last_error = 'cannot connect database. ' . $conn->connect_error; }  mysqli_set_charset($conn, 'utf8'); // 2. select database use  $db_select = mysqli_select_db($conn, db_name);     if (!$db_select){     die("database selection failed: " . mysqli_error()); };  $query = $conn->prepare( "insert user (id, name, gender, email, age, text, score) values (null, ?, ?, ?, ?, ?, ?)" );  $query->bind_param('sssssi', $name,$gender,$email,$age,$text,$score); $query->execute(); $query->close(); 

i having error:

call member function bind_param() on non-object

but when switch other computer , use it, no error.

you should make catching error messages:

if(!($query = $conn->prepare("insert user (id, name, gender, email, age, text, score) values (null, ?, ?, ?, ?, ?, ?)")))     die($conn->error);  if(!$query->bind_param('sssssi', $name,$gender,$email,$age,$text,$score))     die($conn->error);  $query->execute(); $query->close(); 

please see output if there further assistance.