diff --git a/core/modules/views/lib/Drupal/views/Plugin/views/display/Data.php b/core/modules/views/lib/Drupal/views/Plugin/views/display/Data.php
index c038810..1f4d4aa 100644
--- a/core/modules/views/lib/Drupal/views/Plugin/views/display/Data.php
+++ b/core/modules/views/lib/Drupal/views/Plugin/views/display/Data.php
@@ -91,16 +91,16 @@ public function setContentType($content_type) {
    * content type from the request.
    */
   public function getContentType() {
-    if (isset($this->contentType)) {
-      return $this->contentType;
-    }
+    if (!isset($this->contentType)) {
+      // Return the content type based on the request object.
+      $negotiation = drupal_container()->get('content_negotiation');
+      $request = drupal_container()->get('request');
+      $content_type = $negotiation->getContentType($request);
 
-    // Return the content type based on the request object.
-    $negotiation = drupal_container()->get('content_negotiation');
-    $request = drupal_container()->get('request');
-    $content_type = $negotiation->getContentType($request);
+      $this->setContentType($request->getMimeType($content_type));
+    }
 
-    return $request->getMimeType($content_type);
+    return $this->contentType;
   }
 
   /**