wordpress - How to fix undefined offset error in post-template.php -

i trying small business wordpress site unable figure out why site generating error. here details:

the error this: undefined offset: -1 in /home/sojour15/public_html/wp-includes/post-template.php on line 278

and here's code post-template.php - starting line 275 - line 278 "$content = $pages[$page - 1];"

if ( $page > count( $pages ) ) // if requested page doesn't exist     $page = count( $pages ); // give them highest numbered page exist  $content = $pages[$page - 1]; if ( preg_match( '/<!--more(.*?)?-->/', $content, $matches ) ) {     $content = explode( $matches[0], $content, 2 );     if ( ! empty( $matches[1] ) && ! empty( $more_link_text ) )         $more_link_text = strip_tags( wp_kses_no_null( trim( $matches[1] ) ) );      $has_teaser = true; } else {     $content = array( $content ); } 

i have read undefined offset errors , understand means code referring in array doesn't exist not php coder - trying small business - , i'm not sure how fix this. tried hack found somewhere - put '@' in front of line 278. weirdly, hack worked week. it's not working anymore - , better fix code anyway. guidance welcome. thanks. here link 1 of pages happens: https://www.sojournacupuncture.com/treatments-and-services/

$page having 0. thus, $pages[0-1] in array, -1 index not exist.

you can put check if $page empty or 0, should not execute rest of codes. hope works you.

if ( $page > count( $pages ) ) // if requested page doesn't exist     $page = count( $pages ); // give them highest numbered page exist  // check on $page // if not empty, should execute rest if (!empty($page)) {     $content = $pages[$page - 1];     if ( preg_match( '/<!--more(.*?)?-->/', $content, $matches ) ) {         $content = explode( $matches[0], $content, 2 );         if ( ! empty( $matches[1] ) && ! empty( $more_link_text ) )             $more_link_text = strip_tags( wp_kses_no_null( trim( $matches[1] ) ) );          $has_teaser = true;     } else {         $content = array( $content );     } }