diff --git a/templates/skeleton/config.inc.php b/templates/skeleton/config.inc.php
index cea692a9..148c38e1 100644
--- a/templates/skeleton/config.inc.php
+++ b/templates/skeleton/config.inc.php
@@ -59,9 +59,9 @@ $template_config = array(
 );
 
 $template_global_config = array('navigation' => true);
-$template_loaded_config = serendipity_loadThemeOptions($template_config, $serendipity['smarty_vars']['template_option'], true);
+$template_loaded_config = serendipity_loadThemeOptions($template_config, $serendipity['smarty_vars']['template_option'] ?? '', true);
 serendipity_loadGlobalThemeOptions($template_config, $template_loaded_config, $template_global_config);
 
-if ($_SESSION['serendipityUseTemplate']) {
+if (isset($_SESSION['serendipityUseTemplate']) and $_SESSION['serendipityUseTemplate']) {
     $template_loaded_config['use_corenav'] = false;
 }
\ No newline at end of file
diff --git a/templates/skeleton/entries.tpl b/templates/skeleton/entries.tpl
index dfb62f28..466a8cb7 100644
--- a/templates/skeleton/entries.tpl
+++ b/templates/skeleton/entries.tpl
@@ -111,8 +111,8 @@
     <p class="serendipity_msg_notice">{$CONST.NO_ENTRIES_TO_PRINT}</p>
     {/if}
 {/foreach}
-{if not $is_preview}
-    {if $staticpage_pagetitle == ''}
+{if not $is_preview and not $is_single_entry}
+    {if ! isset($staticpage_pagetitle) or $staticpage_pagetitle == ''}
     <nav class="pager u-cf" role="navigation">
         <p>{$footer_info}</p>
     {if $footer_prev_page || $footer_next_page}
diff --git a/templates/skeleton/index.tpl b/templates/skeleton/index.tpl
index c495eb5a..281d9ed6 100644
--- a/templates/skeleton/index.tpl
+++ b/templates/skeleton/index.tpl
@@ -6,7 +6,7 @@
     <meta name="viewport" content="width=device-width, initial-scale=1">
     <title>{$head_title|default:$blogTitle}{if $head_subtitle} | {$head_subtitle}{/if}</title>
     <meta name="generator" content="Serendipity v.{$head_version}">
-{if ($view == "entry" || $view == "start" || $view == "feed" || $view == "plugin" || $staticpage_pagetitle != "" || $robots_index == 'index')}
+{if ($view == "entry" || $view == "start" || $view == "feed" || $view == "plugin" || (isset($staticpage_pagetitle) and $staticpage_pagetitle != "") || (isset($robots_index) and $robots_index == 'index'))}
     <meta name="robots" content="index,follow">
 {else}
     <meta name="robots" content="noindex,follow">