diff --git a/material/assets/javascripts/application.js b/material/assets/javascripts/application.js
index ba9411c57..4abd3a303 100644
--- a/material/assets/javascripts/application.js
+++ b/material/assets/javascripts/application.js
@@ -739,6 +739,7 @@ var Application =
 	      /* Retrieve the facts for the given repository type */
 	      ;(function () {
 	        var el = document.querySelector("[data-md-source]");
+	        if (!el) return Promise.resolve([]);
 	        switch (el.dataset.mdSource) {
 	          case "github":
 	            return new _Material2.default.Source.Adapter.GitHub(el).fetch();
diff --git a/material/partials/header.html b/material/partials/header.html
index 15745a862..f545e3fb9 100644
--- a/material/partials/header.html
+++ b/material/partials/header.html
@@ -34,13 +34,13 @@
         {% endblock %}
       </div>
       <div class="md-flex__cell md-flex__cell--shrink">
-        <div class="md-header-nav__source">
-          {% block repo %}
-            {% if config.repo_url %}
+        {% block repo %}
+          {% if config.repo_url %}
+            <div class="md-header-nav__source">
               {% include "partials/source.html" %}
-            {% endif %}
-          {% endblock %}
-        </div>
+            </div>
+          {% endif %}
+        {% endblock %}
       </div>
     </div>
   </nav>
diff --git a/src/assets/javascripts/application.js b/src/assets/javascripts/application.js
index 9c8f66d66..ae1b693b8 100644
--- a/src/assets/javascripts/application.js
+++ b/src/assets/javascripts/application.js
@@ -196,6 +196,7 @@ export default class Application {
     /* Retrieve the facts for the given repository type */
     ;(() => {
       const el = document.querySelector("[data-md-source]")
+      if (!el) return Promise.resolve([])
       switch (el.dataset.mdSource) {
         case "github": return new Material.Source.Adapter.GitHub(el).fetch()
         default: return Promise.resolve([])
diff --git a/src/partials/header.html b/src/partials/header.html
index 719337b6a..82e5f24ef 100644
--- a/src/partials/header.html
+++ b/src/partials/header.html
@@ -74,13 +74,13 @@
 
       <!-- Repository containing source -->
       <div class="md-flex__cell md-flex__cell--shrink">
-        <div class="md-header-nav__source">
-          {% block repo %}
-            {% if config.repo_url %}
+        {% block repo %}
+          {% if config.repo_url %}
+            <div class="md-header-nav__source">
               {% include "partials/source.html" %}
-            {% endif %}
-          {% endblock %}
-        </div>
+            </div>
+          {% endif %}
+        {% endblock %}
       </div>
     </div>
   </nav>