diff --git a/getarticles.go b/getarticles.go
index e8b9eca..ea6dd1a 100644
--- a/getarticles.go
+++ b/getarticles.go
@@ -70,7 +70,10 @@ func getArticles(feedURL string, max int, noExcerpt bool, filter []string) (stri
 	// Create a hash as identifier for the feed.
 	// The identifier will be used as filename for caching the update time.
 	h := fnv.New32a()
-	h.Write([]byte(feedURL))
+	_, err := h.Write([]byte(feedURL))
+	if err != nil {
+		log.Fatal("Error: Can't create hash for", feedURL + ":", err)
+	}
 	if _, err := os.Stat(cachePath); os.IsNotExist(err) {
 		err = os.MkdirAll(cachePath, 0700)
 		if err != nil {