diff --git a/app/models/match.rb b/app/models/match.rb
index 0c5e676..df8e8b7 100644
--- a/app/models/match.rb
+++ b/app/models/match.rb
@@ -31,6 +31,7 @@ class Match < ApplicationRecord
   private
 
   def evaluate_winner
+    return nil unless finished?
     return nil if match_scores.first.points == match_scores.second.points
 
     match_scores.max_by(&:points).team