diff --git a/frontend/mining-app/lib/presentation/pages/contribution/contribution_page.dart b/frontend/mining-app/lib/presentation/pages/contribution/contribution_page.dart
index 0cf8d3b8..d9d2c51f 100644
--- a/frontend/mining-app/lib/presentation/pages/contribution/contribution_page.dart
+++ b/frontend/mining-app/lib/presentation/pages/contribution/contribution_page.dart
@@ -588,7 +588,7 @@ class ContributionPage extends ConsumerWidget {
               _buildTeamStatItem(
                 context,
                 '已解锁上',
-                contribution != null ? (contribution.unlockedBonusTiers * 5).toString() : null,
+                ((contribution?.unlockedBonusTiers ?? 0) * 5).toString(),
                 '',
                 isLoading,
               ),