diff --git a/2012-prosinec/index.php b/2012-prosinec/index.php
index 4b1bfa7..9d5af68 100644
--- a/2012-prosinec/index.php
+++ b/2012-prosinec/index.php
@@ -17,11 +17,11 @@ if ($uri == '') {
     exit;
 } elseif (preg_match('/^([a-z]{2})\\/(.+)(\\?.*)?$/', $uri, $matches)) {
     $lang = htmlspecialchars(substr($matches[1], 0, 2));
-    if (stringEndsWith($matches[2], 'main')) {
+    if (isset($matches[2]) && stringEndsWith($matches[2], 'main')) {
         header('Location: http://' . $_SERVER['HTTP_HOST'] . $root . $lang . '/' . substr($matches[2], 0, -4));
         exit;
     }
-    $_GET['page'] = $matches[2];
+    $_GET['page'] = $matches[2] ?? '';
 } elseif (preg_match('/^([a-z]{2})\\/(?:(.*)\\/)?$/', $uri, $matches)) {
     $lang = htmlspecialchars(substr($matches[1], 0, 2));
     $_GET['page'] = (isset($matches[2]) ? $matches[2] . '/' : '') . 'main';
diff --git a/2014/index.php b/2014/index.php
index 01fef6a..8e38f16 100644
--- a/2014/index.php
+++ b/2014/index.php
@@ -17,11 +17,11 @@ if ($uri == '') {
     exit;
 } elseif (preg_match('/^([a-z]{2})(?:\\/(.+)(\\?.*)?)?$/', $uri, $matches)) {
     $lang = htmlspecialchars(substr($matches[1], 0, 2));
-    if (stringEndsWith($matches[2], 'main')) {
+    if (isset($matches[2]) && stringEndsWith($matches[2], 'main')) {
         header('Location: http://' . $_SERVER['HTTP_HOST'] . $root . $lang . '/' . substr($matches[2], 0, -4));
         exit;
     }
-    $_GET['page'] = $matches[2];
+    $_GET['page'] = $matches[2] ?? '';
 } elseif (preg_match('/^([a-z]{2})\\/(?:(.*)\\/)?$/', $uri, $matches)) {
     $lang = htmlspecialchars(substr($matches[1], 0, 2));
     $_GET['page'] = (isset($matches[2]) ? $matches[2] . '/' : '') . 'main';
diff --git a/2015-prosinec/index.php b/2015-prosinec/index.php
index 7aeea43..4ea5dfa 100644
--- a/2015-prosinec/index.php
+++ b/2015-prosinec/index.php
@@ -17,11 +17,11 @@ if ($uri == '') {
     exit;
 } elseif (preg_match('/^([a-z]{2})(?:\\/(.+)(\\?.*)?)?$/', $uri, $matches)) {
     $lang = htmlspecialchars(substr($matches[1], 0, 2));
-    if (stringEndsWith($matches[2], 'main')) {
+    if (isset($matches[2]) && stringEndsWith($matches[2], 'main')) {
         header('Location: http://' . $_SERVER['HTTP_HOST'] . $root . $lang . '/' . substr($matches[2], 0, -4));
         exit;
     }
-    $_GET['page'] = $matches[2];
+    $_GET['page'] = $matches[2] ?? '';
 } elseif (preg_match('/^([a-z]{2})\\/(?:(.*)\\/)?$/', $uri, $matches)) {
     $lang = htmlspecialchars(substr($matches[1], 0, 2));
     $_GET['page'] = (isset($matches[2]) ? $matches[2] . '/' : '') . 'main';
diff --git a/2015/index.php b/2015/index.php
index 343082d..0ba55eb 100644
--- a/2015/index.php
+++ b/2015/index.php
@@ -17,11 +17,11 @@ if ($uri == '') {
     exit;
 } elseif (preg_match('/^([a-z]{2})(?:\\/(.+)(\\?.*)?)?$/', $uri, $matches)) {
     $lang = htmlspecialchars(substr($matches[1], 0, 2));
-    if (stringEndsWith($matches[2], 'main')) {
+    if (isset($matches[2]) && stringEndsWith($matches[2], 'main')) {
         header('Location: http://' . $_SERVER['HTTP_HOST'] . $root . $lang . '/' . substr($matches[2], 0, -4));
         exit;
     }
-    $_GET['page'] = $matches[2];
+    $_GET['page'] = $matches[2] ?? '';
 } elseif (preg_match('/^([a-z]{2})\\/(?:(.*)\\/)?$/', $uri, $matches)) {
     $lang = htmlspecialchars(substr($matches[1], 0, 2));
     $_GET['page'] = (isset($matches[2]) ? $matches[2] . '/' : '') . 'main';