[PHP/MySQLi] Fatal error: Call to a member function execute() on a non-object

I do not understand why I am getting an error.. I have done this hundreds of times.

Here's the error that I'm getting:

Fatal error: Call to a member function execute() on a non-object in xxx/core.php on line 11

Code (markup):

Here's the code:

    $sendMessage = $db->prepare("INSERT INTO shouts SET message = ?");
    $message = 'wtf';
    $sendMessage = $sendMessage->bind_param('s', $message);
    $sendMessage->execute();

PHP:

 

Well, I'm not sure just quite what your problem is. Please explain more.

 

Issue sorted - I'm an idiot.

 $sendMessage = $sendMessage->bind_param('s', $message); 

Code (markup):

Should just be:

 $sendMessage->bind_param('s', $message); 

Code (markup):