diff --git a/changelog.html b/changelog.html
index 6ec512e..57f456e 100644
--- a/changelog.html
+++ b/changelog.html
@@ -1,1154 +1,133 @@
-<!DOCTYPE html><html><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1"><style>body {
-  max-width: 980px;
-  border: 1px solid #ddd;
-  outline: 1300px solid #fff;
-  margin: 16px auto;
-}
+<!DOCTYPE html>
+<html>
+<head>
+	<meta charset="utf-8"/>
+	<meta name="creator" content="Marked.app"/>
+</head>
+<body>
 
-body .markdown-body
-{
-  padding: 45px;
-}
+<h1 id="thisisthechangelogformdpremarkdownpreprocessor">This Is The Change Log For mdpre Markdown Preprocessor</h1>
 
-@font-face {
-  font-family: fontawesome-mini;
-  src: 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format('woff');
-}
+<h3 id="releases">Releases</h3>
 
-.markdown-body {
-  font-family: sans-serif;
-  -ms-text-size-adjust: 100%;
-  -webkit-text-size-adjust: 100%;
-  color: #333333;
-  overflow: hidden;
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-  font-size: 16px;
-  line-height: 1.6;
-  word-wrap: break-word;
-}
+<h3 id="v0.6.5-17february2023">v0.6.5 - 17 February, 2023</h3>
 
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+<ul>
+<li><strong>FIXED</strong> Crash with <code>=ifdef</code> where the variable <strong>isn&#8217;t</strong> defined.</li>
+<li><strong>ENHANCED</strong> Added message if there are too few <code>=endif</code>s at the end of the run.</li>
+</ul>
 
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+<h3 id="v0.6.4-16may2022">v0.6.4 - 16 May, 2022</h3>
 
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-</style><title>changelog</title></head><body><article class="markdown-body"><h1 id="this-is-the-change-log-for-mdpre-markdown-preprocessor">This Is The Change Log For mdpre Markdown Preprocessor<a class="headerlink" href="#this-is-the-change-log-for-mdpre-markdown-preprocessor" title="Permanent link"></a></h1>
-<h3 id="releases">Releases<a class="headerlink" href="#releases" title="Permanent link"></a></h3>
-<h3 id="v064-16-may-2022">v0.6.4 - 16 May, 2022<a class="headerlink" href="#v064-16-may-2022" title="Permanent link"></a></h3>
 <ul>
 <li><strong>FIXED</strong> <code>=cal</code> needed 7 cells for all rows.</li>
 </ul>
-<h3 id="v063-5-may-2022">v0.6.3 - 5 May, 2022<a class="headerlink" href="#v063-5-may-2022" title="Permanent link"></a></h3>
+
+<h3 id="v0.6.3-5may2022">v0.6.3 - 5 May, 2022</h3>
+
 <ul>
 <li><strong>ENHANCED</strong> Added <code>=rowspan</code> - to allow easy colouring of text of table rows in a <code>=csv</code> / <code>=endcsv</code> bracket.</li>
 </ul>
-<h3 id="v062-19-march-2022">v0.6.2 - 19 March, 2022<a class="headerlink" href="#v062-19-march-2022" title="Permanent link"></a></h3>
+
+<h3 id="v0.6.2-19march2022">v0.6.2 - 19 March, 2022</h3>
+
 <ul>
 <li><strong>ENHANCED</strong> Calendar has month in a heading row.</li>
 </ul>
-<h3 id="v061-17-march-2022">v0.6.1 - 17 March, 2022<a class="headerlink" href="#v061-17-march-2022" title="Permanent link"></a></h3>
+
+<h3 id="v0.6.1-17march2022">v0.6.1 - 17 March, 2022</h3>
+
 <ul>
 <li><strong>ENHANCED</strong> <code>=caldays</code> and <code>=calnote</code> support a range of day numbers.</li>
 </ul>
-<h3 id="v06-16-march-2022">v0.6 - 16 March, 2022<a class="headerlink" href="#v06-16-march-2022" title="Permanent link"></a></h3>
+
+<h3 id="v0.6-16march2022">v0.6 - 16 March, 2022</h3>
+
 <ul>
 <li><strong>ENHANCED</strong> Month Calendar generation supported -with <code>=cal</code> etc.</li>
 </ul>
-<h3 id="v05-27-november-2021">v0.5 - 27 November, 2021<a class="headerlink" href="#v05-27-november-2021" title="Permanent link"></a></h3>
+
+<h3 id="v0.5-27november2021">v0.5 - 27 November, 2021</h3>
+
 <ul>
 <li><strong>ENHANCED</strong> Symbol resolution happens inline - which means a symbol can be redefined</li>
 <li><strong>ENHANCED</strong> Added <code>=inc</code> and <code>=dec</code> - to increment and decrement values of <strong>integer</strong> variables</li>
 </ul>
-<h3 id="v047-21-november-2021">v0.4.7 - 21 November, 2021<a class="headerlink" href="#v047-21-november-2021" title="Permanent link"></a></h3>
+
+<h3 id="v0.4.7-21november2021">v0.4.7 - 21 November, 2021</h3>
+
 <ul>
 <li><strong>ENHANCED</strong> Recursion check for <code>=include</code></li>
 <li><strong>ENHANCED</strong> <code>=include</code> resolves symbols in filename</li>
 </ul>
-<h3 id="v046-19-october-2020">v0.4.6 - 19 October, 2020<a class="headerlink" href="#v046-19-october-2020" title="Permanent link"></a></h3>
+
+<h3 id="v0.4.6-19october2020">v0.4.6 - 19 October, 2020</h3>
+
 <ul>
 <li><strong>ENHANCED</strong> With -v heading levels can go arbitrarily deep</li>
 </ul>
-<h3 id="v045-14-october-2020">v0.4.5 - 14 October, 2020<a class="headerlink" href="#v045-14-october-2020" title="Permanent link"></a></h3>
+
+<h3 id="v0.4.5-14october2020">v0.4.5 - 14 October, 2020</h3>
+
 <ul>
 <li><strong>FIXED</strong> Did not run with Python 3. Now it does</li>
 </ul>
-<h3 id="v044-7-january-2020">v0.4.4 - 7 January, 2020<a class="headerlink" href="#v044-7-january-2020" title="Permanent link"></a></h3>
-<h3 id="v043-10-march-2019">v0.4.3 - 10 March, 2019<a class="headerlink" href="#v043-10-march-2019" title="Permanent link"></a></h3>
+
+<h3 id="v0.4.4-7january2020">v0.4.4 - 7 January, 2020</h3>
+
+<h3 id="v0.4.3-10march2019">v0.4.3 - 10 March, 2019</h3>
+
 <ul>
 <li><strong>NEW</strong> Added some pre-defined variables</li>
 </ul>
-<h3 id="v042-20-january-2019">v0.4.2 - 20 January, 2019<a class="headerlink" href="#v042-20-january-2019" title="Permanent link"></a></h3>
+
+<h3 id="v0.4.2-20january2019">v0.4.2 - 20 January, 2019</h3>
+
 <ul>
 <li><strong>NEW</strong> <code>-d</code> to define variables</li>
 <li><strong>NEW</strong> <code>-c</code> to wrap everything with <code>=csv</code> and <code>=endcsv</code></li>
 </ul>
-<h3 id="v041-12-january-2019">v0.4.1 - 12 January, 2019<a class="headerlink" href="#v041-12-january-2019" title="Permanent link"></a></h3>
+
+<h3 id="v0.4.1-12january2019">v0.4.1 - 12 January, 2019</h3>
+
 <ul>
 <li><strong>FIXED</strong> <code>=include</code> needed rewriting to use a stack.</li>
 </ul>
-<h3 id="v04-21-october-2018">v0.4 - 21 October, 2018<a class="headerlink" href="#v04-21-october-2018" title="Permanent link"></a></h3>
+
+<h3 id="v0.4-21october2018">v0.4 - 21 October, 2018</h3>
+
 <ul>
 <li><strong>NEW</strong> <code>=stop</code> stops reading in further text</li>
 </ul>
-<h3 id="v03-1-april-2018">v0.3 - 1 April, 2018<a class="headerlink" href="#v03-1-april-2018" title="Permanent link"></a></h3>
+
+<h3 id="v0.3-1april2018">v0.3 - 1 April, 2018</h3>
+
 <ul>
-<li><strong>FIXED</strong> makeLink() didn&rsquo;t coalesce multiple minus signs into a single one.</li>
-<li><strong>FIXED</strong> makeLink() didn&rsquo;t remove double or single quotes.</li>
+<li><strong>FIXED</strong> makeLink() didn&#8217;t coalesce multiple minus signs into a single one.</li>
+<li><strong>FIXED</strong> makeLink() didn&#8217;t remove double or single quotes.</li>
 </ul>
-<h3 id="v02-26-march-2018">v0.2 - 26 March, 2018<a class="headerlink" href="#v02-26-march-2018" title="Permanent link"></a></h3>
+
+<h3 id="v0.2-26march2018">v0.2 - 26 March, 2018</h3>
+
 <ul>
 <li><strong>NEW</strong> <a href="http://textbundle.org">TextBundle</a> support - both TextPack and TextBundle subformats.</li>
 </ul>
-<h3 id="v01-17-march-2018">v0.1 - 17 March, 2018<a class="headerlink" href="#v01-17-march-2018" title="Permanent link"></a></h3>
+
+<h3 id="v0.1-17march2018">v0.1 - 17 March, 2018</h3>
+
 <ul>
-<li>
-<p><strong>NEW</strong> Backslash (<code>\</code>) at end of line joins the next line.</p>
-</li>
-<li>
-<p><strong>NEW</strong> You can specify an automatically-generated Table Of Contents.</p>
-</li>
-<li>
-<p><strong>NEW</strong> Startup banner and normal termination message.</p>
-</li>
-<li>
-<p><strong>NEW</strong> <code>-h</code> Help parameter.</p>
-</li>
-<li>
-<p><strong>NEW</strong> <code>-v</code> &ldquo;Verbose Mode&rdquo; parameter - which just documents files being embedded.</p>
-</li>
+<li><p><strong>NEW</strong> Backslash (<code>\</code>) at end of line joins the next line.</p></li>
+<li><p><strong>NEW</strong> You can specify an automatically-generated Table Of Contents.</p></li>
+<li><p><strong>NEW</strong> Startup banner and normal termination message.</p></li>
+<li><p><strong>NEW</strong> <code>-h</code> Help parameter.</p></li>
+<li><p><strong>NEW</strong> <code>-v</code> &#8220;Verbose Mode&#8221; parameter - which just documents files being embedded.</p></li>
 </ul>
-<h3 id="v00-12-march-2018">v0.0 - 12 March, 2018<a class="headerlink" href="#v00-12-march-2018" title="Permanent link"></a></h3>
+
+<h3 id="v0.0-12march2018">v0.0 - 12 March, 2018</h3>
+
 <ul>
 <li><strong>NEW</strong> Initial release</li>
-</ul></article></body></html>
\ No newline at end of file
+</ul>
+
+</body>
+</html>
\ No newline at end of file
diff --git a/changelog.log b/changelog.log
index 66a7005..64b8e96 100644
--- a/changelog.log
+++ b/changelog.log
@@ -1,34 +1,9 @@
 
-mdpre Markdown Preprocessor v0.6.4 (16 May, 2022)
-=================================================
+mdpre Markdown Preprocessor v0.6.5 (17 February, 2023)
+======================================================
 - opened <stdout> for writing
-Def mdpre_date = 16 May, 2022
-Def mdpre_level = 0.6.4
-Def userid = martinpacker
-Def time = 16&colon;39
-Def date = 16 May&comma; 2022
-This Is The Change Log For mdpre Markdown Preprocessor
-Table Of Contents - spec '2 2 Releases'
 2 2 Releases
-..... .....  v0.6.4 - 16 May, 2022
-..... .....  v0.6.3 - 5 May, 2022
-..... .....  v0.6.2 - 19 March, 2022
-..... .....  v0.6.1 - 17 March, 2022
-..... .....  v0.6 - 16 March, 2022
-..... .....  v0.5 - 27 November, 2021
-..... .....  v0.4.7 - 21 November, 2021
-..... .....  v0.4.6 - 19 October, 2020
-..... .....  v0.4.5 - 14 October, 2020
-..... .....  v0.4.4 - 7 January, 2020
-..... .....  v0.4.3 - 10 March, 2019
-..... .....  v0.4.2 - 20 January, 2019
-..... .....  v0.4.1 - 12 January, 2019
-..... .....  v0.4 - 21 October, 2018
-..... .....  v0.3 - 1 April, 2018
-..... .....  v0.2 - 26 March, 2018
-..... .....  v0.1 - 17 March, 2018
-..... .....  v0.0 - 12 March, 2018
--------------------------------------------------
+------------------------------------------------------
 - Processing completed.
--------------------------------------------------
+------------------------------------------------------
 
diff --git a/changelog.md b/changelog.md
index 0a31aef..ae69958 100644
--- a/changelog.md
+++ b/changelog.md
@@ -3,6 +3,11 @@
 ### Releases
 
 
+### v0.6.5 - 17 February, 2023
+
+* **FIXED** Crash with `=ifdef` where the variable **isn't** defined.
+* **ENHANCED** Added message if there are too few `=endif`s at the end of the run.
+
 ### v0.6.4 - 16 May, 2022
 
 * **FIXED** `=cal` needed 7 cells for all rows.
diff --git a/changelog.mdp b/changelog.mdp
index 0d0b135..624574f 100644
--- a/changelog.mdp
+++ b/changelog.mdp
@@ -2,6 +2,11 @@
 
 =toc 2 2 Releases
 
+### v0.6.5 - 17 February, 2023
+
+* **FIXED** Crash with `=ifdef` where the variable **isn't** defined.
+* **ENHANCED** Added message if there are too few `=endif`s at the end of the run.
+
 ### v0.6.4 - 16 May, 2022
 
 * **FIXED** `=cal` needed 7 cells for all rows.
diff --git a/mdpre b/mdpre
index 27f29bb..81b42f0 100755
--- a/mdpre
+++ b/mdpre
@@ -33,8 +33,8 @@ from enum import Enum
 import calendar
 
 
-mdpre_level = "0.6.4+"
-mdpre_date = "20 June, 2022"
+mdpre_level = "0.6.5"
+mdpre_date = "17 February, 2023"
 banner = "mdpre Markdown Preprocessor v" + mdpre_level + " (" + mdpre_date + ")"
 
 log = partial(print, file=sys.stderr)  # | create log to stderr
@@ -513,7 +513,7 @@ def handle_ifdef(ifdefString):
     if wantVerbose is True:
         verbosity = "<!--mdpre-ifdef:false:" + ifdefString + "-->"
 
-    return [ifStack, verbosity]
+    return verbosity
 
 
 # =ifndef encountered
@@ -532,6 +532,7 @@ def handle_ifndef(ifndefString):
             return verbosity
 
     # Variable is undefined
+
     ifStack.append(True)
     if wantVerbose is True:
         verbosity = "<!--mdpre-ifndef:true:" + ifndefString + "-->"
@@ -965,8 +966,10 @@ def handle_linejoins(input_file):
     input_file2 = []
     output_line = ""
     pending = False
+
     for line in input_file:
         output_line += line
+
         if line.endswith("\\\n"):
             # Next line should be concatenated to this one
             output_line = output_line[:-2]
@@ -1539,6 +1542,14 @@ for line in input_file:
 # NOTE: toFile.close() is handled in the new exits function
 # NOTE: ! this message will self destruct during the pull request
 
+# Issue a warning if 1 or more =endif statements are missing
+if (l := len(ifStack)) > 1:
+    if l == 2:
+        sys.stderr.write(f'Warning 1 =endif statement missing.')
+    else:
+        sys.stderr.write(f'Warning {str(l - 1)} =endif statements missing.')
+
+# Optionally zip into TextPack format
 if wantTextPack is True:
     if wantVerbose is True:
         print("Archiving " + realpath + " to " + zippath + ".zip")
