on update to 1.10 - preg_match(): Compilation failed

preg_match(): Compilation failed: disallowed Unicode code point (>= 0xd800 && <= 0xdfff) at offset 1811 in /sites/all/modules/ctools/includes/cleanstring.inc on line 157

/ctools/includes/cleanstring.inc 
lines 154-168

// In preparation for pattern matching,
  // escape the separator if and only if it is not alphanumeric.
  if (isset($settings['separator'])) {
    if (preg_match('/^[^'. CTOOLS_PREG_CLASS_ALNUM .']+$/uD', $settings['separator'])) {
      $seppattern = $settings['separator'];
    }
    else {
      $seppattern = '\\'. $settings['separator'];
    }
    // Trim any leading or trailing separators (note the need to
    $output = preg_replace("/^$seppattern+|$seppattern+$/", '', $output);

    // Replace multiple separators with a single one
    $output = preg_replace("/$seppattern+/", $settings['separator'], $output);
  }