diff --git a/backend/mpc-system/services/service-party-app/src/pages/Session.tsx b/backend/mpc-system/services/service-party-app/src/pages/Session.tsx
index a8fc8454..0dda488f 100644
--- a/backend/mpc-system/services/service-party-app/src/pages/Session.tsx
+++ b/backend/mpc-system/services/service-party-app/src/pages/Session.tsx
@@ -187,7 +187,7 @@ export default function Session() {
           {/* 参与方列表 */}
           <div className={styles.section}>
             <h3 className={styles.sectionTitle}>
-              参与方 ({(session.participants || []).length} / {session.threshold.n})
+              参与方 ({(session.participants || []).length} / {session.threshold?.n || 0})
             </h3>
             <div className={styles.participantList}>
               {(session.participants || []).map((participant, index) => (
@@ -201,7 +201,7 @@ export default function Session() {
                   </span>
                 </div>
               ))}
-              {Array.from({ length: Math.max(0, session.threshold.n - (session.participants || []).length) }).map((_, index) => (
+              {Array.from({ length: Math.max(0, (session.threshold?.n || 0) - (session.participants || []).length) }).map((_, index) => (
                 <div key={`empty-${index}`} className={`${styles.participant} ${styles.participantEmpty}`}>
                   <div className={styles.participantInfo}>
                     <span className={styles.participantIndex}>#{(session.participants || []).length + index + 1}</span>
@@ -214,6 +214,7 @@ export default function Session() {
           </div>
 
           {/* 阈值信息 */}
+          {session.threshold && (
           <div className={styles.section}>
             <h3 className={styles.sectionTitle}>阈值设置</h3>
             <div className={styles.thresholdInfo}>
@@ -225,6 +226,7 @@ export default function Session() {
               </span>
             </div>
           </div>
+          )}
 
           {/* 完成状态 */}
           {session.status === 'completed' && session.publicKey && (