diff --git a/lisp/net/shr.el b/lisp/net/shr.el
index 900b8ec3f5c..07fcbebce08 100644
--- a/lisp/net/shr.el
+++ b/lisp/net/shr.el
@@ -924,7 +924,8 @@ If EXTERNAL, browse the URL using `shr-external-browser'."
     (let ((param (match-string 4 data))
 	  (payload (url-unhex-string (match-string 5 data))))
       (when (string-match "^.*\\(;[ \t]*base64\\)$" param)
-	(setq payload (base64-decode-string payload)))
+	(setq payload (ignore-errors
+                        (base64-decode-string payload))))
       payload)))
 
 ;; Behind display-graphic-p test.