diff --git a/app/models/competition.rb b/app/models/competition.rb
index 684db8fa5..8b9d59ed2 100644
--- a/app/models/competition.rb
+++ b/app/models/competition.rb
@@ -80,12 +80,12 @@ class Competition < ApplicationRecord
 
   # 老师是否能多次报名
   def teacher_multiple_limited?
-    teacher_staff.mutiple_limited?
+    teacher_staff&.mutiple_limited?
   end
 
   # 队员是否能多次报名
   def member_multiple_limited?
-    member_staff.mutiple_limited?
+    member_staff&.mutiple_limited?
   end
 
   def max_min_stage_time