From: Stefan Monnier <monnier@iro.umontreal.ca>
Date: Tue, 20 Apr 2004 20:40:41 +0000 (+0000)
Subject: (read-number): Check whether `default' is nil.
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(read-number): Check whether `default' is nil.
---

diff --git a/lisp/subr.el b/lisp/subr.el
index 39a9caa3106..81f774bdc68 100644
--- a/lisp/subr.el
+++ b/lisp/subr.el
@@ -1329,7 +1329,8 @@ Optional DEFAULT is a default password to use instead of empty input."
     (while
 	(progn
 	  (let ((str (read-from-minibuffer prompt nil nil nil nil
-					   (number-to-string default))))
+					   (and default
+						(number-to-string default)))))
 	    (setq n (cond
 		     ((zerop (length str)) default)
 		     ((stringp str) (read str)))))