diff --git a/app/controllers/epp_controller.rb b/app/controllers/epp_controller.rb
index 1cf54559e..c27ce1e6b 100644
--- a/app/controllers/epp_controller.rb
+++ b/app/controllers/epp_controller.rb
@@ -236,6 +236,8 @@ class EppController < ApplicationController
   end
   # rubocop: enable Style/PredicateName
 
+  # rubocop: disable Metrics/PerceivedComplexity
+  # rubocop: disable Metrics/CyclomaticComplexity
   def write_to_epp_log
     # return nil if EPP_LOG_ENABLED
     request_command = params[:command] || params[:action] # error receives :command, other methods receive :action
@@ -257,4 +259,6 @@ class EppController < ApplicationController
       ip: request.ip
     })
   end
+  # rubocop: enable Metrics/PerceivedComplexity
+  # rubocop: enable Metrics/CyclomaticComplexity
 end
diff --git a/app/controllers/registrant/domain_update_confirms_controller.rb b/app/controllers/registrant/domain_update_confirms_controller.rb
index 7cdcd3f4b..9830b5331 100644
--- a/app/controllers/registrant/domain_update_confirms_controller.rb
+++ b/app/controllers/registrant/domain_update_confirms_controller.rb
@@ -8,6 +8,8 @@ class Registrant::DomainUpdateConfirmsController < RegistrantController
     @domain = nil unless @domain.registrant_update_confirmable?(params[:token])
   end
 
+  # rubocop: disable Metrics/PerceivedComplexity
+  # rubocop: disable Metrics/CyclomaticComplexity
   def update
     @domain = Domain.find(params[:id])
     unless @domain.registrant_update_confirmable?(params[:token])
@@ -37,4 +39,6 @@ class Registrant::DomainUpdateConfirmsController < RegistrantController
       end
     end
   end
+  # rubocop: enable Metrics/PerceivedComplexity
+  # rubocop: enable Metrics/CyclomaticComplexity
 end
diff --git a/app/models/certificate.rb b/app/models/certificate.rb
index c5b18ebe7..a6fdd9b6b 100644
--- a/app/models/certificate.rb
+++ b/app/models/certificate.rb
@@ -14,9 +14,8 @@ class Certificate < ActiveRecord::Base
   validate :validate_csr_and_crt
 
   def validate_csr_and_crt
-    if csr.blank? && crt.blank?
-      errors.add(:base, I18n.t(:crt_or_csr_must_be_present))
-    end
+    return if csr.present? || crt.present?
+    errors.add(:base, I18n.t(:crt_or_csr_must_be_present))
   end
 
   def parsed_crt
diff --git a/app/models/domain.rb b/app/models/domain.rb
index 621f7f6e0..3355469f1 100644
--- a/app/models/domain.rb
+++ b/app/models/domain.rb
@@ -297,7 +297,6 @@ class Domain < ActiveRecord::Base
     registrant.try(:name)
   end
 
-
   # rubocop:disable Lint/Loop
   def generate_auth_info
     begin