2 files changed, 3 insertions, 3 deletions

diff --git a/application/bookmark/LinkUtils.php b/application/bookmark/LinkUtils.php
index 68914fca..e7af4d55 100644
--- a/application/bookmark/LinkUtils.php
+++ b/application/bookmark/LinkUtils.php
@@ -26,7 +26,7 @@ function html_extract_title($html)
  */
 function header_extract_charset($header)
 {
-    preg_match('/charset="?([^; ]+)/i', $header, $match);
+    preg_match('/charset=["\']?([^; "\']+)/i', $header, $match);
     if (! empty($match[1])) {
         return strtolower(trim($match[1]));
     }
diff --git a/application/front/controller/admin/ManageShaareController.php b/application/front/controller/admin/ManageShaareController.php
index ca2da9b5..59ba2de9 100644
--- a/application/front/controller/admin/ManageShaareController.php
+++ b/application/front/controller/admin/ManageShaareController.php
@@ -69,7 +69,7 @@ class ManageShaareController extends ShaarliAdminController
                         $retrieveDescription
                     )
                 );
-                if (! empty($title) && strtolower($charset) !== 'utf-8') {
+                if (! empty($title) && strtolower($charset) !== 'utf-8' && mb_check_encoding($charset)) {
                     $title = mb_convert_encoding($title, 'utf-8', $charset);
                 }
             }
@@ -127,7 +127,7 @@ class ManageShaareController extends ShaarliAdminController
         $this->checkToken($request);
 
         // lf_id should only be present if the link exists.
-        $id = $request->getParam('lf_id') ? intval(escape($request->getParam('lf_id'))) : null;
+        $id = $request->getParam('lf_id') !== null ? intval(escape($request->getParam('lf_id'))) : null;
         if (null !== $id && true === $this->container->bookmarkService->exists($id)) {
             // Edit
             $bookmark = $this->container->bookmarkService->get($id);