diff --git a/CHANGES.md b/CHANGES.md
index b30e868..12fd597 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -2,6 +2,13 @@ Changes in Mini-XML
 ===================
 
 
+Changes in Mini-XML 4.0.4
+-------------------------
+
+- Fixed an issue when reporting errors with a `NULL` options pointer
+  (Issue #329)
+
+
 Changes in Mini-XML 4.0.3
 -------------------------
 
diff --git a/configure b/configure
index 02f967e..ceedcb9 100755
--- a/configure
+++ b/configure
@@ -1,6 +1,6 @@
 #! /bin/sh
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.71 for Mini-XML 4.0.3.
+# Generated by GNU Autoconf 2.71 for Mini-XML 4.0.4.
 #
 # Report bugs to <https://github.com/michaelrsweet/mxml/issues>.
 #
@@ -610,8 +610,8 @@ MAKEFLAGS=
 # Identity of this package.
 PACKAGE_NAME='Mini-XML'
 PACKAGE_TARNAME='mxml'
-PACKAGE_VERSION='4.0.3'
-PACKAGE_STRING='Mini-XML 4.0.3'
+PACKAGE_VERSION='4.0.4'
+PACKAGE_STRING='Mini-XML 4.0.4'
 PACKAGE_BUGREPORT='https://github.com/michaelrsweet/mxml/issues'
 PACKAGE_URL='https://www.msweet.org/mxml'
 
@@ -1300,7 +1300,7 @@ if test "$ac_init_help" = "long"; then
   # Omit some internal or obsolete options to make the list less imposing.
   # This message is too long to be a string in the A/UX 3.1 sh.
   cat <<_ACEOF
-\`configure' configures Mini-XML 4.0.3 to adapt to many kinds of systems.
+\`configure' configures Mini-XML 4.0.4 to adapt to many kinds of systems.
 
 Usage: $0 [OPTION]... [VAR=VALUE]...
 
@@ -1366,7 +1366,7 @@ fi
 
 if test -n "$ac_init_help"; then
   case $ac_init_help in
-     short | recursive ) echo "Configuration of Mini-XML 4.0.3:";;
+     short | recursive ) echo "Configuration of Mini-XML 4.0.4:";;
    esac
   cat <<\_ACEOF
 
@@ -1469,7 +1469,7 @@ fi
 test -n "$ac_init_help" && exit $ac_status
 if $ac_init_version; then
   cat <<\_ACEOF
-Mini-XML configure 4.0.3
+Mini-XML configure 4.0.4
 generated by GNU Autoconf 2.71
 
 Copyright (C) 2021 Free Software Foundation, Inc.
@@ -1668,7 +1668,7 @@ cat >config.log <<_ACEOF
 This file contains any messages produced by compilers while
 running configure, to aid debugging if configure makes a mistake.
 
-It was created by Mini-XML $as_me 4.0.3, which was
+It was created by Mini-XML $as_me 4.0.4, which was
 generated by GNU Autoconf 2.71.  Invocation command line was
 
   $ $0$ac_configure_args_raw
@@ -2426,7 +2426,7 @@ ac_compiler_gnu=$ac_cv_c_compiler_gnu
 ac_config_headers="$ac_config_headers config.h"
 
 
-MXML_VERSION="4.0.3"
+MXML_VERSION="4.0.4"
 
 
 printf "%s\n" "#define MXML_VERSION \"Mini-XML v$MXML_VERSION\"" >>confdefs.h
@@ -5236,7 +5236,7 @@ cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
 # report actual input values of CONFIG_FILES etc. instead of their
 # values after options handling.
 ac_log="
-This file was extended by Mini-XML $as_me 4.0.3, which was
+This file was extended by Mini-XML $as_me 4.0.4, which was
 generated by GNU Autoconf 2.71.  Invocation command line was
 
   CONFIG_FILES    = $CONFIG_FILES
@@ -5301,7 +5301,7 @@ ac_cs_config_escaped=`printf "%s\n" "$ac_cs_config" | sed "s/^ //; s/'/'\\\\\\\\
 cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
 ac_cs_config='$ac_cs_config_escaped'
 ac_cs_version="\\
-Mini-XML config.status 4.0.3
+Mini-XML config.status 4.0.4
 configured by $0, generated by GNU Autoconf 2.71,
   with options \\"\$ac_cs_config\\"
 
diff --git a/configure.ac b/configure.ac
index a6bc393..bc371f4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -14,7 +14,7 @@ AC_PREREQ([2.70])
 
 
 dnl Package name and version...
-AC_INIT([Mini-XML], [4.0.3], [https://github.com/michaelrsweet/mxml/issues], [mxml], [https://www.msweet.org/mxml])
+AC_INIT([Mini-XML], [4.0.4], [https://github.com/michaelrsweet/mxml/issues], [mxml], [https://www.msweet.org/mxml])
 AC_CONFIG_HEADERS([config.h])
 
 MXML_VERSION="AC_PACKAGE_VERSION"
diff --git a/mxml.spec b/mxml.spec
index 3f3cc23..68f365e 100644
--- a/mxml.spec
+++ b/mxml.spec
@@ -11,7 +11,7 @@
 
 Summary: Small XML file parsing library
 Name: mxml
-Version: 4.0.3
+Version: 4.0.4
 Release: 1
 License: Apache 2.0
 Group: Development/Libraries
diff --git a/vcnet/config.h b/vcnet/config.h
index 5065330..992d7e4 100644
--- a/vcnet/config.h
+++ b/vcnet/config.h
@@ -57,7 +57,7 @@
 // Version number
 //
 
-#  define MXML_VERSION "Mini-XML v4.0.3"
+#  define MXML_VERSION "Mini-XML v4.0.4"
 
 
 //
diff --git a/xcode/config.h b/xcode/config.h
index 7924748..71cde81 100644
--- a/xcode/config.h
+++ b/xcode/config.h
@@ -22,7 +22,7 @@
 // Version number
 //
 
-#  define MXML_VERSION "Mini-XML v4.0.3"
+#  define MXML_VERSION "Mini-XML v4.0.4"
 
 
 //