diff --git a/lib/federation/activity_stream/converter/utils.ex b/lib/federation/activity_stream/converter/utils.ex
index 3bba5f3dc..29ca105bf 100644
--- a/lib/federation/activity_stream/converter/utils.ex
+++ b/lib/federation/activity_stream/converter/utils.ex
@@ -179,8 +179,10 @@ defmodule Mobilizon.Federation.ActivityStream.Converter.Utils do
 
   def maybe_fetch_actor_and_attributed_to_id(_), do: {:error, :no_actor_found}
 
-  @spec fetch_actor(String.t()) :: {:ok, Actor.t()} | {:error, atom()}
-  def fetch_actor(actor_url) do
+  @spec fetch_actor(String.t() | map()) :: {:ok, Actor.t()} | {:error, atom()}
+  def fetch_actor(%{"id" => actor_url}) when is_binary(actor_url), do: fetch_actor(actor_url)
+
+  def fetch_actor(actor_url) when is_binary(actor_url) do
     case ActivityPubActor.get_or_fetch_actor_by_url(actor_url) do
       {:ok, %Actor{suspended: false} = actor} ->
         {:ok, actor}
@@ -193,6 +195,8 @@ defmodule Mobilizon.Federation.ActivityStream.Converter.Utils do
     end
   end
 
+  def fetch_actor(_), do: {:error, :no_actor_found}
+
   @spec process_pictures(map(), integer()) :: Keyword.t()
   def process_pictures(object, actor_id) do
     attachements = Map.get(object, "attachment", [])