diff --git a/js/src/views/Discussions/Create.vue b/js/src/views/Discussions/Create.vue
index adec42d16..f7ff343e2 100644
--- a/js/src/views/Discussions/Create.vue
+++ b/js/src/views/Discussions/Create.vue
@@ -3,7 +3,11 @@
     <h1>{{ $t("Create a discussion") }}</h1>
 
     <form @submit.prevent="createDiscussion">
-      <b-field :label="$t('Title')">
+      <b-field
+        :label="$t('Title')"
+        :message="errors.title"
+        :type="errors.title ? 'is-danger' : undefined"
+      >
         <b-input aria-required="true" required v-model="discussion.title" />
       </b-field>
 
@@ -64,7 +68,10 @@ export default class CreateDiscussion extends Vue {
 
   discussion = { title: "", text: "" };
 
+  errors = { title: "" };
+
   async createDiscussion(): Promise<void> {
+    this.errors = { title: "" };
     try {
       if (!this.group.id || !this.currentActor.id) return;
       const { data } = await this.$apollo.mutate({
@@ -86,7 +93,11 @@ export default class CreateDiscussion extends Vue {
     } catch (error) {
       console.error(error);
       if (error.graphQLErrors && error.graphQLErrors.length > 0) {
-        this.$notifier.error(error.graphQLErrors[0].message);
+        if (error.graphQLErrors[0].field == "title") {
+          this.errors.title = error.graphQLErrors[0].message;
+        } else {
+          this.$notifier.error(error.graphQLErrors[0].message);
+        }
       }
     }
   }
diff --git a/lib/federation/activity_pub/types/discussions.ex b/lib/federation/activity_pub/types/discussions.ex
index f57af16e7..f9b615d68 100644
--- a/lib/federation/activity_pub/types/discussions.ex
+++ b/lib/federation/activity_pub/types/discussions.ex
@@ -7,6 +7,7 @@ defmodule Mobilizon.Federation.ActivityPub.Types.Discussions do
   alias Mobilizon.Federation.ActivityPub.Audience
   alias Mobilizon.Federation.ActivityPub.Types.Entity
   alias Mobilizon.Federation.ActivityStream.Convertible
+  alias Mobilizon.GraphQL.API.Utils, as: APIUtils
   alias Mobilizon.Service.Activity.Discussion, as: DiscussionActivity
   alias Mobilizon.Web.Endpoint
   import Mobilizon.Federation.ActivityPub.Utils, only: [make_create_data: 2, make_update_data: 2]
@@ -17,7 +18,8 @@ defmodule Mobilizon.Federation.ActivityPub.Types.Discussions do
   @impl Entity
   @spec create(map(), map()) :: {:ok, map()}
   def create(%{discussion_id: discussion_id} = args, additional) when not is_nil(discussion_id) do
-    with %Discussion{} = discussion <- Discussions.get_discussion(discussion_id),
+    with args <- prepare_args(args),
+         %Discussion{} = discussion <- Discussions.get_discussion(discussion_id),
          {:ok, %Discussion{last_comment_id: last_comment_id} = discussion} <-
            Discussions.reply_to_discussion(discussion, args),
          {:ok, _} <-
@@ -39,7 +41,8 @@ defmodule Mobilizon.Federation.ActivityPub.Types.Discussions do
   @impl Entity
   @spec create(map(), map()) :: {:ok, map()}
   def create(args, additional) do
-    with {:ok, %Discussion{} = discussion} <-
+    with args <- prepare_args(args),
+         {:ok, %Discussion{} = discussion} <-
            Discussions.create_discussion(args),
          {:ok, _} <-
            DiscussionActivity.insert_activity(discussion, subject: "discussion_created"),
@@ -118,4 +121,18 @@ defmodule Mobilizon.Federation.ActivityPub.Types.Discussions do
 
     :ok
   end
+
+  defp prepare_args(args) do
+    {text, _mentions, _tags} =
+      APIUtils.make_content_html(
+        args |> Map.get(:text, "") |> String.trim(),
+        # Can't put additional tags on a comment
+        [],
+        "text/html"
+      )
+
+    args
+    |> Map.update(:title, "", &String.trim/1)
+    |> Map.put(:text, text)
+  end
 end
diff --git a/lib/graphql/resolvers/discussion.ex b/lib/graphql/resolvers/discussion.ex
index cfe4f5b7b..328b0d718 100644
--- a/lib/graphql/resolvers/discussion.ex
+++ b/lib/graphql/resolvers/discussion.ex
@@ -104,6 +104,9 @@ defmodule Mobilizon.GraphQL.Resolvers.Discussion do
            }) do
       {:ok, discussion}
     else
+      {:error, :discussion, err, _} ->
+        {:error, err}
+
       {:member, false} ->
         {:error, :unauthorized}
     end
diff --git a/lib/mobilizon/discussions/discussion.ex b/lib/mobilizon/discussions/discussion.ex
index 8e06b3294..99ac93795 100644
--- a/lib/mobilizon/discussions/discussion.ex
+++ b/lib/mobilizon/discussions/discussion.ex
@@ -28,6 +28,7 @@ defmodule Mobilizon.Discussions.Discussion do
   alias Mobilizon.Discussions.Discussion.TitleSlug
   alias Mobilizon.Web.Endpoint
   alias Mobilizon.Web.Router.Helpers, as: Routes
+  import Mobilizon.Web.Gettext, only: [dgettext: 2]
 
   @type t :: %__MODULE__{
           creator: Actor.t(),
@@ -63,7 +64,7 @@ defmodule Mobilizon.Discussions.Discussion do
     discussion
     |> cast(attrs, @attrs)
     |> maybe_generate_id()
-    |> validate_required([:title, :id])
+    |> validate_required([:title, :id], message: dgettext("errors", "can't be blank"))
     |> TitleSlug.maybe_generate_slug()
     |> TitleSlug.unique_constraint()
     |> maybe_generate_url()