diff --git a/inc/common.php b/inc/common.php
index e14bd7af4ac1b3688b45ac8ce7bb20b4a1de5a49..17facd249d100346eb8986a98dc27e32210b52ed 100644
--- a/inc/common.php
+++ b/inc/common.php
@@ -1860,7 +1860,7 @@ function valid_input_set($param, $valid_values, $array, $exc = '') {
  */
 function get_doku_pref($pref, $default) {
     $enc_pref = urlencode($pref);
-    if(strpos($_COOKIE['DOKU_PREFS'], $enc_pref) !== false) {
+    if(isset($_COOKIE['DOKU_PREFS']) && strpos($_COOKIE['DOKU_PREFS'], $enc_pref) !== false) {
         $parts = explode('#', $_COOKIE['DOKU_PREFS']);
         $cnt   = count($parts);
         for($i = 0; $i < $cnt; $i += 2) {
diff --git a/lib/exe/css.php b/lib/exe/css.php
index 925b78a761dfad5b017acbc547fabd0a207d6b74..507a687371798b97d0aefe22bbfd215b2817fdf1 100644
--- a/lib/exe/css.php
+++ b/lib/exe/css.php
@@ -296,12 +296,12 @@ function css_styleini($tpl, $preview=false) {
         $data = parse_ini_file($ini, true);
 
         // stylesheets
-        if(is_array($data['stylesheets'])) foreach($data['stylesheets'] as $file => $mode){
+        if(isset($data['stylesheets']) && is_array($data['stylesheets'])) foreach($data['stylesheets'] as $file => $mode){
             $stylesheets[$mode][$incbase.$file] = $webbase;
         }
 
         // replacements
-        if(is_array($data['replacements'])){
+        if(isset($data['replacements']) && is_array($data['replacements'])){
             $replacements = array_merge($replacements, css_fixreplacementurls($data['replacements'],$webbase));
         }
     }