diff --git a/src/utils/ModalManager.js b/src/utils/ModalManager.js
index 9c1dfd2..6b169be 100644
--- a/src/utils/ModalManager.js
+++ b/src/utils/ModalManager.js
@@ -237,8 +237,8 @@ class ModalManager {
     }
 }
 
-// Export for use in renderer
-if (typeof window !== 'undefined') {
+// Export for use in renderer - avoid duplicate declaration
+if (typeof window !== 'undefined' && !window.ModalManager) {
     window.ModalManager = ModalManager;
 }