diff --git a/web/themes/custom/reha/reha.theme b/web/themes/custom/reha/reha.theme
index d05dd66..1f17dc1 100644
--- a/web/themes/custom/reha/reha.theme
+++ b/web/themes/custom/reha/reha.theme
@@ -117,10 +117,12 @@ function reha_preprocess_block(&$variables) {
 function reha_preprocess_field(&$variables){
   if($variables['field_name'] === 'field_adresse_site'){
     foreach($variables['items'] as $index => $adr){
-      $postal_code = $variables['items'][$index]['content']['postal_code']['#value'];
-      $pattern = '/(\d{2})(\d+)/i';
-      $replacement = '($1)';
-      $variables['items'][$index]['content']['postal_code']['#value'] = preg_replace($pattern, $replacement, $postal_code);
+      if (isset($variables['items'][$index]['content']['postal_code'])) {
+        $postal_code = $variables['items'][$index]['content']['postal_code']['#value'];
+        $pattern = '/(\d{2})(\d+)/i';
+        $replacement = '($1)';
+        $variables['items'][$index]['content']['postal_code']['#value'] = preg_replace($pattern, $replacement, $postal_code);
+      }
     }
   }
 }
\ No newline at end of file