just-the-docs.js in just-the-docs-0.6.1

- old
+ new

@@ -74,10 +74,12 @@
 // The page-specific <style> in the <head> is needed only when JS is disabled.
 // Moreover, it incorrectly overrides dynamic stylesheets set by setTheme(theme). 
 // The page-specific stylesheet is assumed to have index 1 in the list of stylesheets.
 
 function disableHeadStyleSheet() {
-  document.styleSheets[1].disabled = true;
+  if (document.styleSheets[1]) {
+    document.styleSheets[1].disabled = true;
+  }
 }
 
 {%- if site.search_enabled != false %}
 // Site search
 