Debugger shows Notice warning for v1.4

Notice Undefined index: pages on line 98 in file /home/foo/wp-content/plugins/wordpress-post-tabs/wordpress-post-tabs.php

Section of code in question

function wpts_wp_init() {
    global $post,$wpts;
	if(is_singular() or $wpts['enable_everywhere'] == '1') {
		$enablewpts = get_post_meta($post->ID, 'enablewpts', true);
98)-->	if( (is_page() and ((!empty($enablewpts) and $enablewpts=='1') or  $wpts['pages'] != '0'  ) )
			or (is_single() and ((!empty($enablewpts) and $enablewpts=='1') or $wpts['posts'] != '0'  ) ) or $wpts['enable_everywhere'] == '1' )
		{

http://wordpress.org/plugins/wordpress-post-tabs/