diff --git a/layouts/partials/comments/provider/utterances.html b/layouts/partials/comments/provider/utterances.html
index 97a0a3a7..b1e370bb 100644
--- a/layouts/partials/comments/provider/utterances.html
+++ b/layouts/partials/comments/provider/utterances.html
@@ -16,6 +16,8 @@
 </style>
 
 <script>
+    let utterancesLoaded = false;
+
     function setUtterancesTheme(theme) {
         let utterances = document.querySelector('.utterances iframe');
         if (utterances) {
@@ -31,10 +33,14 @@
 
     addEventListener('message', event => {
         if (event.origin !== 'https://utteranc.es') return;
+
+        /// Called when Utterances is ready
+        utterancesLoaded = true;
         setUtterancesTheme(document.documentElement.dataset.scheme)
     });
 
     window.addEventListener('onColorSchemeChange', (e) => {
+        if (!utterancesLoaded) return;
         setUtterancesTheme(e.detail)
     })
 </script>