diff --git a/app/models/mod_action.rb b/app/models/mod_action.rb
index c47ba0e5b..035ef7cbe 100644
--- a/app/models/mod_action.rb
+++ b/app/models/mod_action.rb
@@ -1,6 +1,7 @@
 class ModAction < ActiveRecord::Base
   belongs_to :creator, :class_name => "User"
   before_validation :initialize_creator, :on => :create
+  validates_presence_of :creator_id
   attr_accessible :description
 
   def self.search(params = {})