fix accessing undefined variable

AlexejKossmann · Feb 25, 2021 · 36dcf5e · 36dcf5e
1 parent 1873bcc
commit 36dcf5e
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/core-bundle/src/Resources/contao/classes/Backend.php b/core-bundle/src/Resources/contao/classes/Backend.php
@@ -894,7 +894,7 @@ public static function addPagesBreadcrumb($strKey='tl_page_node')
 		$arrLinks = array_reverse($arrLinks);
 
 		// Insert breadcrumb menu
-		$GLOBALS['TL_DCA']['tl_page']['list']['sorting']['breadcrumb'] .= '
+		$GLOBALS['TL_DCA']['tl_page']['list']['sorting']['breadcrumb'] = ($GLOBALS['TL_DCA']['tl_page']['list']['sorting']['breadcrumb'] ?? '') . '
 
 <nav aria-label="' . $GLOBALS['TL_LANG']['MSC']['breadcrumbMenu'] . '">
   <ul id="tl_breadcrumb">
@@ -1068,7 +1068,7 @@ public static function addFilesBreadcrumb($strKey='tl_files_node')
 		$GLOBALS['TL_DCA']['tl_files']['list']['sorting']['root'] = array($strNode);
 
 		// Insert breadcrumb menu
-		$GLOBALS['TL_DCA']['tl_files']['list']['sorting']['breadcrumb'] .= '
+		$GLOBALS['TL_DCA']['tl_files']['list']['sorting']['breadcrumb'] = ($GLOBALS['TL_DCA']['tl_files']['list']['sorting']['breadcrumb'] ?? '') . '
 
 <nav aria-label="' . $GLOBALS['TL_LANG']['MSC']['breadcrumbMenu'] . '">
   <ul id="tl_breadcrumb">