Ensure counters only get updated if the record exists

app/models/answer.rb

@@ -28,13 +28,13 @@ class Answer < ApplicationRecord
       end
     end
 
-    self.user.decrement! :answered_count
-    self.question.decrement! :answer_count
+    self.user&.decrement! :answered_count
+    self.question&.decrement! :answer_count
     self.smiles.each do |smile|
       Notification.denotify self.user, smile
     end
     self.comments.each do |comment|
-      comment.user.decrement! :commented_count
+      comment.user&.decrement! :commented_count
       Subscription.denotify comment, self
     end
     Notification.denotify self.question.user, self

app/models/appendable/reaction.rb

@@ -10,8 +10,8 @@ class Appendable::Reaction < Appendable
 
   before_destroy do
     Notification.denotify parent.user, self
-    user.decrement! :smiled_count
-    parent.decrement! :smile_count
+    user&.decrement! :smiled_count
+    parent&.decrement! :smile_count
   end
   # rubocop:enable Rails/SkipsModelValidations
 

app/models/comment.rb

@@ -24,8 +24,8 @@ class Comment < ApplicationRecord
     end
 
     Subscription.denotify self, answer
-    user.decrement!  :commented_count
-    answer.decrement! :comment_count
+    user&.decrement!  :commented_count
+    answer&.decrement! :comment_count
   end
 
   def notification_type(*_args)

app/models/question.rb

@@ -16,7 +16,7 @@ class Question < ApplicationRecord
       end
     end
 
-    user.decrement! :asked_count unless self.author_is_anonymous
+    user&.decrement! :asked_count unless self.author_is_anonymous
   end
 
   def can_be_removed?

app/models/user.rb

@@ -45,8 +45,8 @@ class User < ApplicationRecord
   has_many :subscriptions, dependent: :destroy_async
   has_many :totp_recovery_codes, dependent: :destroy_async
 
-  has_one :profile, dependent: :destroy_async
-  has_one :theme, dependent: :destroy_async
+  has_one :profile, dependent: :destroy
+  has_one :theme, dependent: :destroy
 
   has_many :bans, class_name: "UserBan", dependent: :destroy_async
   has_many :banned_users, class_name: 'UserBan',