Don't let the user unfollow their own account.

lib/pleroma/user.ex

@@ -167,7 +167,7 @@ defmodule Pleroma.User do
 
   def unfollow(%User{} = follower, %User{} = followed) do
     ap_followers = followed.follower_address
-    if following?(follower, followed) do
+    if following?(follower, followed) and follower.ap_id != followed.ap_id do
       following = follower.following
       |> List.delete(ap_followers)
 

test/user_test.exs

@@ -66,6 +66,15 @@ defmodule Pleroma.UserTest do
     assert user.following == []
   end
 
+  test "unfollow doesn't unfollow yourself" do
+    user = insert(:user)
+
+    {:error, _} = User.unfollow(user, user)
+
+    assert user.following == [user.ap_id]
+  end
+
+
   test "test if a user is following another user" do
     followed = insert(:user)
     user = insert(:user, %{following: [User.ap_followers(followed)]})