diff --git a/core/lib/Drupal/Core/Field/FormatterBase.php b/core/lib/Drupal/Core/Field/FormatterBase.php
index cd3e28f..6e6242b 100644
--- a/core/lib/Drupal/Core/Field/FormatterBase.php
+++ b/core/lib/Drupal/Core/Field/FormatterBase.php
@@ -112,10 +112,7 @@ public function view(FieldItemListInterface $items, $langcode = NULL) {
    * Returns the cardinality setting of the field instance.
    */
   protected function getCardinality() {
-    if ($this->fieldDefinition instanceof \Drupal\Core\Field\FieldDefinitionInterface) {
-      return $this->fieldDefinition->getFieldStorageDefinition()->getCardinality();
-    }
-    return 0;
+    return $this->fieldDefinition->getFieldStorageDefinition()->getCardinality();
   }
 
   /**
@@ -163,13 +160,13 @@ public function settingsForm(array $form, FormStateInterface $form_state) {
   public function settingsSummary() {
     $summary = [];
     $limit =  $this->getSetting('limit');
-    $offset = $this->getSetting('offset');
 
-    if ($this->getCardinality() == 1 || (empty($limit) && empty($offset))) {
+    if ($this->getCardinality() == 1 || empty($limit)) {
       return $summary;
     }
 
-    $summary[] = $this->t('Display %limit items, skip %offset items.', [
+    $offset = $this->getSetting('offset');
+    $summary[] = $this->t('Display %limit items, skip %offset item(s).', [
       '%limit' => $limit,
       '%offset' => $offset
     ]);