1 files changed, 9 insertions, 4 deletions
diff --git a/config/nimdoc.cfg b/config/nimdoc.cfg
index ed1b346a2..cdf49197d 100644
--- a/config/nimdoc.cfg
+++ b/config/nimdoc.cfg
@@ -252,7 +252,6 @@ function main() {
     }
   }
 
-  const toggleSwitch = document.querySelector('.theme-switch input[type="checkbox"]');
   function switchTheme(e) {
       if (e.target.checked) {
           document.documentElement.setAttribute('data-theme', 'dark');
@@ -263,13 +262,19 @@ function main() {
       }
   }
 
-  toggleSwitch.addEventListener('change', switchTheme, false);
+  const toggleSwitch = document.querySelector('.theme-switch input[type="checkbox"]');
+  if (toggleSwitch !== null) {
+    toggleSwitch.addEventListener('change', switchTheme, false);
+  }
 
-  const currentTheme = localStorage.getItem('theme') ? localStorage.getItem('theme') : null;
+  var currentTheme = localStorage.getItem('theme');
+  if (!currentTheme && window.matchMedia('(prefers-color-scheme: dark)').matches) {
+    currentTheme = 'dark';
+  }
   if (currentTheme) {
     document.documentElement.setAttribute('data-theme', currentTheme);
 
-    if (currentTheme === 'dark') {
+    if (currentTheme === 'dark' && toggleSwitch !== null) {
       toggleSwitch.checked = true;
     }
   }