diff --git a/core/modules/link/src/Plugin/Field/FieldFormatter/LinkSeparateFormatter.php b/core/modules/link/src/Plugin/Field/FieldFormatter/LinkSeparateFormatter.php
index 2598b55b6fb8..115ae5398f7d 100644
--- a/core/modules/link/src/Plugin/Field/FieldFormatter/LinkSeparateFormatter.php
+++ b/core/modules/link/src/Plugin/Field/FieldFormatter/LinkSeparateFormatter.php
@@ -63,7 +63,7 @@ class LinkSeparateFormatter extends LinkFormatter {
       }
       $url_title = $url->toString();
       if (!empty($settings['trim_length'])) {
-        $link_title = Unicode::truncate($link_title, $settings['trim_length'], FALSE, TRUE);
+        $link_title = $link_title !== NULL ? Unicode::truncate($link_title, $settings['trim_length'], FALSE, TRUE) : NULL;
         $url_title = Unicode::truncate($url_title, $settings['trim_length'], FALSE, TRUE);
       }
 
diff --git a/core/modules/menu_link_content/src/Plugin/migrate/source/MenuLink.php b/core/modules/menu_link_content/src/Plugin/migrate/source/MenuLink.php
index 1b186a6e04a1..fe45b946ef65 100644
--- a/core/modules/menu_link_content/src/Plugin/migrate/source/MenuLink.php
+++ b/core/modules/menu_link_content/src/Plugin/migrate/source/MenuLink.php
@@ -111,7 +111,10 @@ class MenuLink extends DrupalSqlBase {
     }
     $row->setSourceProperty('options', unserialize($row->getSourceProperty('options')));
     $row->setSourceProperty('enabled', !$row->getSourceProperty('hidden'));
-    $row->setSourceProperty('description', Unicode::truncate($row->getSourceProperty('options/attributes/title'), 255));
+    $description = $row->getSourceProperty('options/attributes/title');
+    if ($description !== NULL) {
+      $row->setSourceProperty('description', Unicode::truncate($description, 255));
+    }
 
     return parent::prepareRow($row);
   }