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Warning: htmlspecialchars() expects parameter 1 to be string, array given in .../administrator/components/com_civicrm/civicrm/packages/HTML/Common.php on line 144 under Joomla and CiviCRM 5.11.0 when running Event Reports -> Attendee List. There is no longer a Joomla demo site it seems, so cannot reproduce there. It seems linked to an empty custom field value, but I'm not sure which one.

A workaround is to test for the value type before attempting to call htmlspecialchars:

      if (is_array($value)) {
              if (count($value) == 0) {
                $value1 = '';  // an empty string
                $strAttr .= ' ' . $key . '="' . htmlspecialchars($value1, ENT_COMPAT, $charset) . '"';
              }
              else {
                foreach ($value as $value1) {
                  $strAttr .= ' ' . $key . '="' . htmlspecialchars($value1, ENT_COMPAT, $charset) . '"';
                }
              }
            }
            else {
              $strAttr .= ' ' . $key . '="' . htmlspecialchars($value, ENT_COMPAT, $charset) . '"';
            }
        }

Has anyone any comments?