diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 9e9107ce3..be0dd4773 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -194,7 +194,7 @@ amd64:
   variables: &release-variables
     MIX_ENV: prod
   before_script: &before-release
-  - apt install cmake -y
+  - apt-get update && apt-get install -y cmake
   - echo "import Mix.Config" > config/prod.secret.exs
   - mix local.hex --force
   - mix local.rebar --force
diff --git a/lib/mix/pleroma.ex b/lib/mix/pleroma.ex
index 074492a46..fe9b0d16c 100644
--- a/lib/mix/pleroma.ex
+++ b/lib/mix/pleroma.ex
@@ -14,7 +14,7 @@ defmodule Mix.Pleroma do
     :swoosh,
     :timex
   ]
-  @cachex_children ["object", "user"]
+  @cachex_children ["object", "user", "scrubber"]
   @doc "Common functions to be reused in mix tasks"
   def start_pleroma do
     Pleroma.Config.Holder.save_default()
diff --git a/lib/mix/tasks/pleroma/emoji.ex b/lib/mix/tasks/pleroma/emoji.ex
index f4eaeac98..8f52ee98d 100644
--- a/lib/mix/tasks/pleroma/emoji.ex
+++ b/lib/mix/tasks/pleroma/emoji.ex
@@ -15,7 +15,7 @@ defmodule Mix.Tasks.Pleroma.Emoji do
     {options, [], []} = parse_global_opts(args)
 
     url_or_path = options[:manifest] || default_manifest()
-    manifest = fetch_and_decode(url_or_path)
+    manifest = fetch_and_decode!(url_or_path)
 
     Enum.each(manifest, fn {name, info} ->
       to_print = [
@@ -42,7 +42,7 @@ defmodule Mix.Tasks.Pleroma.Emoji do
 
     url_or_path = options[:manifest] || default_manifest()
 
-    manifest = fetch_and_decode(url_or_path)
+    manifest = fetch_and_decode!(url_or_path)
 
     for pack_name <- pack_names do
       if Map.has_key?(manifest, pack_name) do
@@ -92,7 +92,7 @@ defmodule Mix.Tasks.Pleroma.Emoji do
           ])
         )
 
-        files = fetch_and_decode(files_loc)
+        files = fetch_and_decode!(files_loc)
 
         IO.puts(IO.ANSI.format(["Unpacking ", :bright, pack_name]))
 
@@ -243,9 +243,11 @@ defmodule Mix.Tasks.Pleroma.Emoji do
     IO.puts("Emoji packs have been reloaded.")
   end
 
-  defp fetch_and_decode(from) do
+  defp fetch_and_decode!(from) do
     with {:ok, json} <- fetch(from) do
       Jason.decode!(json)
+    else
+      {:error, error} -> raise "#{from} cannot be fetched. Error: #{error} occur."
     end
   end
 
diff --git a/lib/pleroma/emails/user_email.ex b/lib/pleroma/emails/user_email.ex
index 313533859..1d8c72ae9 100644
--- a/lib/pleroma/emails/user_email.ex
+++ b/lib/pleroma/emails/user_email.ex
@@ -107,25 +107,34 @@ defmodule Pleroma.Emails.UserEmail do
       |> Enum.filter(&(&1.activity.data["type"] == "Create"))
       |> Enum.map(fn notification ->
         object = Pleroma.Object.normalize(notification.activity)
-        object = update_in(object.data["content"], &format_links/1)
 
-        %{
-          data: notification,
-          object: object,
-          from: User.get_by_ap_id(notification.activity.actor)
-        }
+        if not is_nil(object) do
+          object = update_in(object.data["content"], &format_links/1)
+
+          %{
+            data: notification,
+            object: object,
+            from: User.get_by_ap_id(notification.activity.actor)
+          }
+        end
       end)
+      |> Enum.filter(& &1)
 
     followers =
       notifications
       |> Enum.filter(&(&1.activity.data["type"] == "Follow"))
       |> Enum.map(fn notification ->
-        %{
-          data: notification,
-          object: Pleroma.Object.normalize(notification.activity),
-          from: User.get_by_ap_id(notification.activity.actor)
-        }
+        from = User.get_by_ap_id(notification.activity.actor)
+
+        if not is_nil(from) do
+          %{
+            data: notification,
+            object: Pleroma.Object.normalize(notification.activity),
+            from: User.get_by_ap_id(notification.activity.actor)
+          }
+        end
       end)
+      |> Enum.filter(& &1)
 
     unless Enum.empty?(mentions) do
       styling = Config.get([__MODULE__, :styling])
diff --git a/test/emails/mailer_test.exs b/test/emails/mailer_test.exs
index 3da45056b..9e232d2a0 100644
--- a/test/emails/mailer_test.exs
+++ b/test/emails/mailer_test.exs
@@ -14,10 +14,10 @@ defmodule Pleroma.Emails.MailerTest do
     subject: "Pleroma test email",
     to: [{"Test User", "user1@example.com"}]
   }
-  setup do: clear_config([Pleroma.Emails.Mailer, :enabled])
+  setup do: clear_config([Pleroma.Emails.Mailer, :enabled], true)
 
   test "not send email when mailer is disabled" do
-    Pleroma.Config.put([Pleroma.Emails.Mailer, :enabled], false)
+    clear_config([Pleroma.Emails.Mailer, :enabled], false)
     Mailer.deliver(@email)
     :timer.sleep(100)
 
diff --git a/test/tasks/digest_test.exs b/test/tasks/digest_test.exs
index eefbc8936..0b444c86d 100644
--- a/test/tasks/digest_test.exs
+++ b/test/tasks/digest_test.exs
@@ -17,6 +17,8 @@ defmodule Mix.Tasks.Pleroma.DigestTest do
     :ok
   end
 
+  setup do: clear_config([Pleroma.Emails.Mailer, :enabled], true)
+
   describe "pleroma.digest test" do
     test "Sends digest to the given user" do
       user1 = insert(:user)
diff --git a/test/tasks/email_test.exs b/test/tasks/email_test.exs
index 944c07064..c3af7ef68 100644
--- a/test/tasks/email_test.exs
+++ b/test/tasks/email_test.exs
@@ -16,6 +16,8 @@ defmodule Mix.Tasks.Pleroma.EmailTest do
     :ok
   end
 
+  setup do: clear_config([Pleroma.Emails.Mailer, :enabled], true)
+
   describe "pleroma.email test" do
     test "Sends test email with no given address" do
       mail_to = Config.get([:instance, :email])