diff --git a/src/Resources/contao/dca/tl_style_manager.php b/src/Resources/contao/dca/tl_style_manager.php
index d7fbc65..d16ece1 100644
--- a/src/Resources/contao/dca/tl_style_manager.php
+++ b/src/Resources/contao/dca/tl_style_manager.php
@@ -71,7 +71,7 @@
                 'label'               => &$GLOBALS['TL_LANG']['tl_style_manager']['delete'],
                 'href'                => 'act=delete',
                 'icon'                => 'delete.svg',
-                'attributes'          => 'onclick="if(!confirm(\'' . $GLOBALS['TL_LANG']['MSC']['deleteConfirm'] . '\'))return false;Backend.getScrollOffset()"'
+                'attributes'          => 'onclick="if(!confirm(\'' . ($GLOBALS['TL_LANG']['MSC']['deleteConfirm'] ?? null) . '\'))return false;Backend.getScrollOffset()"'
             ),
             'show' => array
             (
diff --git a/src/Resources/contao/dca/tl_style_manager_archive.php b/src/Resources/contao/dca/tl_style_manager_archive.php
index a306f5e..36f4820 100644
--- a/src/Resources/contao/dca/tl_style_manager_archive.php
+++ b/src/Resources/contao/dca/tl_style_manager_archive.php
@@ -94,7 +94,7 @@
                 'label'               => &$GLOBALS['TL_LANG']['tl_style_manager_archive']['delete'],
                 'href'                => 'act=delete',
                 'icon'                => 'delete.svg',
-                'attributes'          => 'onclick="if(!confirm(\'' . $GLOBALS['TL_LANG']['MSC']['deleteConfirm'] . '\'))return false;Backend.getScrollOffset()"'
+                'attributes'          => 'onclick="if(!confirm(\'' . ($GLOBALS['TL_LANG']['MSC']['deleteConfirm'] ?? null) . '\'))return false;Backend.getScrollOffset()"'
             ),
             'show' => array
             (