diff --git a/source_clean/src/cloud/notification.service.ts b/source_clean/src/cloud/notification.service.ts
index 6faa931..aecd3bc 100644
--- a/source_clean/src/cloud/notification.service.ts
+++ b/source_clean/src/cloud/notification.service.ts
@@ -92,7 +92,7 @@ export function notifyInfo(title: string, detail: string): void {
 }
 
 function applyTemplate(template: string, vars: Record<string, string>): string {
-  return template.replace(/\{([^}]+)\}/g, (_, key) => vars[key] || '{' + key + '}');
+  return template.replace(/\{([^}]+)\}/g, (_, key) => vars[key] ?? '{' + key + '}');
 }
 
 function getEventTemplates(): Record<string, { title?: string; content: string }> {