--- mimedefang.c.original       2009-09-03 23:06:46.000000000 +0200
+++ mimedefang.c        2010-02-01 23:34:59.000000000 +0100
@@ -368,8 +368,9 @@ do_reply(SMFICTX *ctx, char const *code,
     }

     /* Convert remaining newlines to spaces */
-    while(*s) {
+    while(s && *s) {
        if (*s == '\n') *s = ' ';
+       s++;
     }

     /* Sigh... wtf were milter developers thinking??? */