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I'm getting the following error message when I try to view everyone's appointments:
Notice: Undefined offset: -1 in /home/brick/public_html/apt/core/base/code/core/objects/Service.php on line 121

In Service.php line 121 is the 5th line below:

    function _getSessionById( $sessionId ){
        $return = array();
        $sessions = $this->getProp( 'sessions_array' );
        if( count($sessions) >= $sessionId ){
            $return = $sessions[ $sessionId - 1 ];
            }
        else {
            echo 'Service ' . $this->getProp('name') . ' do not have session id = ' . $sessionId;
            }
        return $return;
        }


Help?