diff --git a/app/controllers/clients_controller.rb b/app/controllers/clients_controller.rb
index af03c9e90..346115ca5 100644
--- a/app/controllers/clients_controller.rb
+++ b/app/controllers/clients_controller.rb
@@ -152,7 +152,7 @@ def destroy
       status = 400
       Rails.logger.warn message
       render json: { errors: [{ status: status.to_s, title: message }] }.to_json, status: status
-    elsif @client.update(is_active: nil, deleted_at: Time.zone.now)
+    elsif @client.update(is_active: false, deleted_at: Time.zone.now)
       @client.send_delete_email(responsible_id: current_user.uid) unless Rails.env.test?
       head :no_content
     else
diff --git a/app/controllers/providers_controller.rb b/app/controllers/providers_controller.rb
index a2b79036a..86136aac8 100644
--- a/app/controllers/providers_controller.rb
+++ b/app/controllers/providers_controller.rb
@@ -206,7 +206,7 @@ def destroy
       status = 400
       Rails.logger.warn message
       render json: { errors: [{ status: status.to_s, title: message }] }.to_json, status: status
-    elsif @provider.update_attributes(is_active: nil, deleted_at: Time.zone.now)
+    elsif @provider.update_attributes(is_active: false, deleted_at: Time.zone.now)
       @provider.send_delete_email(responsible_id: current_user.uid) unless Rails.env.test?
       head :no_content
     else
diff --git a/app/controllers/repositories_controller.rb b/app/controllers/repositories_controller.rb
index 3e0e8d46c..338260d93 100644
--- a/app/controllers/repositories_controller.rb
+++ b/app/controllers/repositories_controller.rb
@@ -182,7 +182,7 @@ def destroy
       status = 400
       Rails.logger.warn message
       render json: { errors: [{ status: status.to_s, title: message }] }.to_json, status: status
-    elsif @client.update_attributes(is_active: nil, deleted_at: Time.zone.now)
+    elsif @client.update_attributes(is_active: false, deleted_at: Time.zone.now)
       @client.send_delete_email unless Rails.env.test?
       head :no_content
     else
diff --git a/app/models/concerns/helpable.rb b/app/models/concerns/helpable.rb
index ab62f42c2..53f0b80d2 100644
--- a/app/models/concerns/helpable.rb
+++ b/app/models/concerns/helpable.rb
@@ -55,7 +55,7 @@ def register_url
 
       if [200, 201].include?(response.status)
         # update minted column after first successful registration in handle system
-        self.update_attributes(minted: Time.zone.now, updated: Time.zone.now) if minted.blank?
+        self.update_attributes(minted: Time.zone.now, updated_at: Time.zone.now) if minted.blank?
         Rails.logger.info "[Handle] URL for DOI " + doi + " updated to " + url + "." unless Rails.env.test?
 
         self.__elasticsearch__.index_document
diff --git a/lib/tasks/client.rake b/lib/tasks/client.rake
index 8532c9a81..154cf552a 100644
--- a/lib/tasks/client.rake
+++ b/lib/tasks/client.rake
@@ -129,7 +129,7 @@ namespace :client do
       Rake::Task["prefix:delete"].invoke
     end
 
-    if client.update_attributes(is_active: nil, deleted_at: Time.zone.now)
+    if client.update_attributes(is_active: false, deleted_at: Time.zone.now)
       client.send_delete_email(responsible_id: "admin") unless Rails.env.test?
       puts "Client with client ID #{ENV['CLIENT_ID']} deleted."
     else