Calais is throwing a php warning: warning: mysqli_real_escape_string() expects parameter 2 to be string

I'm using the manual tag modifier with Open Calais Semantic Proxy. When I click the Tag with Calais tab, a warning is given.

warning: mysqli_real_escape_string() expects parameter 2 to be string, array given in /home/MY_SITE/public_html/MY_SUB_DIRECTORY/includes/database.mysqli.inc on line 323.

I modified the code in database.mysqli.inc to look at what is being passed in the $text variable.

/**
 * Prepare user input for use in a database query, preventing SQL injection attacks.
 */
function db_escape_string($text) {
  global $active_db; 
  if (gettype($text) != 'string') {
  print "<pre>";
  print_r ($text . "<br />");
  print (gettype($text) . "<br /> <br />");
  print "</pre>";
  }
  return mysqli_real_escape_string($active_db, $text);
}

This is the output.

<pre><br>NULL<br> <br></pre>
<pre><br>NULL<br> <br></pre>
<pre>1<br>integer<br> <br></pre>

What is going on here?