diff --git a/main/document/document.inc.php b/main/document/document.inc.php
index d85d13e0dc..536c77c185 100755
--- a/main/document/document.inc.php
+++ b/main/document/document.inc.php
@@ -212,7 +212,10 @@ function create_document_link(
     $send_to = null;
     if (!$show_as_icon) {
         if ($filetype == 'folder') {
-            if (api_is_allowed_to_edit() || api_is_platform_admin() || api_get_setting('students_download_folders') == 'true') {
+            if (api_is_allowed_to_edit() ||
+                api_is_platform_admin() ||
+                api_get_setting('students_download_folders') == 'true'
+            ) {
                 //filter when I am into shared folder, I can show for donwload only my shared folder
                 if (is_shared_folder($curdirpath, $current_session_id)) {
                     if (preg_match('/shared_folder\/sf_user_' . api_get_user_id() . '$/', urldecode($forcedownload_link)) ||
diff --git a/main/document/slideshow.php b/main/document/slideshow.php
index 9de3cd119f..d956352916 100755
--- a/main/document/slideshow.php
+++ b/main/document/slideshow.php
@@ -15,7 +15,7 @@ api_protect_course_script();
 $noPHP_SELF = true;
 $path = Security::remove_XSS($_GET['curdirpath']);
 $pathurl = urlencode($path);
-$slide_id = Security::remove_XSS($_GET['slide_id']);
+$slide_id = isset($_GET['slide_id']) ? Security::remove_XSS($_GET['slide_id']) : null;
 
 if (empty($slide_id)) {
 	$edit_slide_id = 1;
@@ -423,7 +423,7 @@ if ($slide_id != 'all' && !empty($image_files_only)) {
 		list($width, $height) = getimagesize($image);
 
 		//auto resize
-		if ($_SESSION["image_resizing"]!="noresizing" && $_SESSION["image_resizing"]!="resizing" ) {
+		if ($_SESSION["image_resizing"] !="noresizing" && $_SESSION["image_resizing"]!="resizing") {
 		?>
 
 		<script type="text/javascript">