diff --git a/uncloseai.js b/uncloseai.js
index 74ab27c..9994edb 100644
--- a/uncloseai.js
+++ b/uncloseai.js
@@ -1478,8 +1478,21 @@ function openHermesModal() {
       const pageTitle = document.title;
       const pageUrl = window.location.href;
       
-      // Create cache key based on page content hash
-      const contentHash = btoa(pageContent.substring(0, 1000)).replace(/[^a-zA-Z0-9]/g, '').substring(0, 32);
+      // Create cache key based on page content hash (handle Unicode safely)
+      const contentForHash = pageContent.substring(0, 1000);
+      let contentHash;
+      try {
+        contentHash = btoa(unescape(encodeURIComponent(contentForHash))).replace(/[^a-zA-Z0-9]/g, '').substring(0, 32);
+      } catch (e) {
+        // Fallback: use simple string hash if btoa fails
+        let hash = 0;
+        for (let i = 0; i < contentForHash.length; i++) {
+          const char = contentForHash.charCodeAt(i);
+          hash = ((hash << 5) - hash) + char;
+          hash = hash & hash; // Convert to 32bit integer
+        }
+        contentHash = Math.abs(hash).toString(36).substring(0, 32);
+      }
       const cacheKey = `hermes-intro-${contentHash}`;
       
       // Check if we have a cached introduction for this page content