diff --git a/app/models/contestant.rb b/app/models/contestant.rb
index 9e270d8..77238f1 100644
--- a/app/models/contestant.rb
+++ b/app/models/contestant.rb
@@ -28,7 +28,7 @@ class Contestant < ApplicationRecord
   has_and_belongs_to_many :categories
 
   before_validation :initialize_time_seconds_if_empty
-  before_commit :generate_qrcode, on: :create
+  before_save :generate_qrcode, if: -> { !qrcode.present? }
 
   validates :name, presence: true
   validates :time_seconds, presence: true