diff --git a/web_app/static/script.js b/web_app/static/script.js
index 441a4ed..e5489ef 100644
--- a/web_app/static/script.js
+++ b/web_app/static/script.js
@@ -613,6 +613,7 @@ function handleLyricLineClick(lineNumber) {
 async function generatePoster() {
     if (!currentMetadata) return;
 
+    generateBtn.disabled = true;
     loadingOverlay.style.display = 'flex';
 
     const indexingToggle = document.getElementById('indexingToggle');
@@ -675,6 +676,8 @@ async function generatePoster() {
     } catch (error) {
         console.error("Generation failed", error);
         showToast(`Error: ${error.message}`, "error");
+    } finally {
+        generateBtn.disabled = false;
         loadingOverlay.style.display = 'none';
     }
 }