diff --git a/app/models/inbox.rb b/app/models/inbox.rb
index 1a1a0066..96f3dc84 100644
--- a/app/models/inbox.rb
+++ b/app/models/inbox.rb
@@ -14,15 +14,16 @@ class Inbox < ApplicationRecord
   end
 
   after_create do
-    user.touch(:inbox_updated_at)
+    user.touch(:inbox_updated_at) # rubocop:disable Rails/SkipsModelValidations
   end
 
   after_update do
-    user.touch(:inbox_updated_at)
+    user.touch(:inbox_updated_at) # rubocop:disable Rails/SkipsModelValidations
   end
 
   after_destroy do
-    user.touch(:inbox_updated_at)
+    # user might not exist at this point (account deleted, records are cleaned up async)
+    user&.touch(:inbox_updated_at) # rubocop:disable Rails/SkipsModelValidations
   end
 
   def answer(answer_content, user)
@@ -49,7 +50,7 @@ class Inbox < ApplicationRecord
                 user.profile.anon_display_name || APP_CONFIG["anonymous_name"]
               else
                 question.user.profile.safe_name
-              end
+              end,
       ),
       icon:  notification_icon,
       body:  question.content.truncate(Question::SHORT_QUESTION_MAX_LENGTH),
diff --git a/app/models/notification.rb b/app/models/notification.rb
index e36cad0a..76233c67 100644
--- a/app/models/notification.rb
+++ b/app/models/notification.rb
@@ -5,15 +5,16 @@ class Notification < ApplicationRecord
   belongs_to :target, polymorphic: true
 
   after_create do
-    recipient.touch(:notifications_updated_at)
+    recipient.touch(:notifications_updated_at) # rubocop:disable Rails/SkipsModelValidations
   end
 
   after_update do
-    recipient.touch(:notifications_updated_at)
+    recipient.touch(:notifications_updated_at) # rubocop:disable Rails/SkipsModelValidations
   end
 
   after_destroy do
-    recipient.touch(:notifications_updated_at)
+    # recipient might not exist at this point (account deleted, records are cleaned up async)
+    recipient&.touch(:notifications_updated_at) # rubocop:disable Rails/SkipsModelValidations
   end
 
   class << self
diff --git a/spec/models/inbox_spec.rb b/spec/models/inbox_spec.rb
new file mode 100644
index 00000000..9a00635a
--- /dev/null
+++ b/spec/models/inbox_spec.rb
@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+describe Inbox, type: :model do
+  describe "associations" do
+    it { should belong_to(:user) }
+    it { should belong_to(:question) }
+  end
+
+  describe "before_destroy" do
+    let(:user) { FactoryBot.create(:user) }
+    let(:question) { FactoryBot.create(:question, author_is_anonymous: true) }
+
+    it "does not fail if the user wants to delete their account" do
+      Inbox.create(user:, question:)
+
+      # this deletes the User record and enqueues the deletion of all
+      # associated records in sidekiq
+      user.destroy!
+
+      # so let's drain the queues
+      expect { Sidekiq::Worker.drain_all }.not_to raise_error
+    end
+  end
+end
diff --git a/spec/models/notification_spec.rb b/spec/models/notification_spec.rb
new file mode 100644
index 00000000..9bf3aea8
--- /dev/null
+++ b/spec/models/notification_spec.rb
@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+describe Notification, type: :model do
+  describe "associations" do
+    it { should belong_to(:recipient) }
+    it { should belong_to(:target) }
+  end
+
+  describe "before_destroy" do
+    let(:user) { FactoryBot.create(:user) }
+    let(:answer) { FactoryBot.create(:answer, user: FactoryBot.create(:user)) }
+
+    it "does not fail if the user wants to delete their account" do
+      Notification::QuestionAnswered.create(recipient: user, target: answer)
+
+      # this deletes the User record and enqueues the deletion of all
+      # associated records in sidekiq
+      user.destroy!
+
+      # so let's drain the queues
+      expect { Sidekiq::Worker.drain_all }.not_to raise_error
+    end
+  end
+end