php problems? Strict standards.

Hi i have had a strange message come up after a upgrade of php

Warning: Creating default object from empty value in C:\xampp\htdocs\wp-content\themes\knowledgepress\lib\ticket-functions.php on line 851

but when i look at the line of code it is

if (!function_exists('woo_supportpress_get_ticket_details')) {
	function woo_supportpress_get_ticket_details( $post_id ) { 

		$status = current(wp_get_object_terms( $post_id, 'ticket_status' ));
		$type = current(wp_get_object_terms( $post_id, 'ticket_type' ));
		$priority = current(wp_get_object_terms( $post_id, 'ticket_priority' ));

		if (!isset($status->name)) $status = '';

		if (!isset($type->name)) $type = '';

		if (!isset($priority->name)) $priority = '';

		$ticket_details = array(
			'status' => $status
			,'type' => $type
			,'priority' => $priority
			,'assigned_to' => get_user_by('id', get_post_meta( $post_id, '_responsible', true))
			,'reported_by' => get_post_meta( $post_id, '_reported_by', true)
			,'reported_by_email' => get_post_meta( $post_id, '_reported_by_email', true)
		);

		/* Support 'Anybody' user */
		if (!isset($ticket_details['assigned_to']->display_name)) $ticket_details['assigned_to']->display_name = 'Anybody';
		if (!isset($ticket_details['assigned_to']->ID)) $ticket_details['assigned_to']->ID = 0;

		return $ticket_details;

	}
}

Whats going on? is it a php version problem?

The line of code calling the function is

<?php $ticket_details = woo_supportpress_get_ticket_details( $post->ID ); ?>