title: $stmt - call_user_func_array expects parameter 1 to be a valid callback
body: <p>I'm having these problems no matter how much I tried to fix them.
  I'm working on an HTML Visual Editor CMS and every time I log in these errors show up.</p>
  <p>Here are the errors:</p>
  <pre><code>call_user_func_array() expects parameter 1 to be a valid callback, first array member is not a valid class name or object
  Call to a member function execute() on boolean
  </code></pre>
  <p>Here's the relevant part of code:</p>
  <pre><code>$stmt = $this-&gt;connection-&gt;prepare($query);
  call_user_func_array(array($stmt,&quot;bind_param&quot;) ,$this-&gt;refValues($param_arr));
  </code></pre>