1 files changed, 2 insertions, 2 deletions

diff --git a/lisp/xml.el b/lisp/xml.el
index 2232746f02a..a3d34670bfb 100644
--- a/lisp/xml.el
+++ b/lisp/xml.el
@@ -611,7 +611,7 @@ references."
                    xml-validating-parser
                    (error "XML: (Validity) Invalid character reference `%s'"
                           (match-string 0)))
-              (replace-match (or (string val) xml-undefined-entity) t t))
+              (replace-match (if val (string val) xml-undefined-entity) t t))
           ;; For an entity reference, search again from the start of
           ;; the replaced text, since the replacement can contain
           ;; entity or character references, or markup.
@@ -620,7 +620,7 @@ references."
           (and (null val)
                xml-validating-parser
                (error "XML: (Validity) Undefined entity `%s'" ref))
-          (replace-match (cdr val) t t)
+          (replace-match (or (cdr val) xml-undefined-entity) t t)
           (goto-char (match-beginning 0)))
         ;; Check for XML bombs.
         (and xml-entity-expansion-limit