diff --git a/core/modules/image/src/Plugin/Field/FieldFormatter/ImageFormatter.php b/core/modules/image/src/Plugin/Field/FieldFormatter/ImageFormatter.php
index 069178d..4602ab5 100644
--- a/core/modules/image/src/Plugin/Field/FieldFormatter/ImageFormatter.php
+++ b/core/modules/image/src/Plugin/Field/FieldFormatter/ImageFormatter.php
@@ -119,7 +119,9 @@ public function viewElements(FieldItemListInterface $items) {
     $cache_tags = array();
     if (!empty($image_style_setting)) {
       $image_style = entity_load('image_style', $image_style_setting);
-      $cache_tags = $image_style->getCacheTag();
+      if (isset($image_style)) {
+        $cache_tags = $image_style->getCacheTag();
+      }
     }
 
     foreach ($items as $delta => $item) {