diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 27029a5a4..d639430be 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -290,7 +290,7 @@ build-and-push-docker-tag:
 
 # Packaging app for amd64
 package-app:
-  image: mobilizon/buildpack:1.14.1-erlang-25.1.1-debian-buster
+  image: mobilizon/buildpack:1.15.5-erlang-26.0.2-debian-buster
   stage: package
   variables: &release-variables
     MIX_ENV: "prod"
diff --git a/js/src/composition/apollo/tags.ts b/js/src/composition/apollo/tags.ts
index 252cd1013..da9c06835 100644
--- a/js/src/composition/apollo/tags.ts
+++ b/js/src/composition/apollo/tags.ts
@@ -11,7 +11,12 @@ export function fetchTags(text: string): Promise<ITag[]> {
       })
     );
 
-    onResult(({ data }) => resolve(data.tags));
+    onResult((result) => {
+      if (result.loading) {
+        return;
+      }
+      return resolve(result.data.tags);
+    });
 
     onError((error) => reject(error));
   });
diff --git a/js/src/views/InteractView.vue b/js/src/views/InteractView.vue
index e8be781d7..ef63cbdfc 100644
--- a/js/src/views/InteractView.vue
+++ b/js/src/views/InteractView.vue
@@ -68,7 +68,13 @@ const { onResult, onError, loading } = useQuery<{
   })
 );
 
-onResult(async ({ data: { interact } }) => {
+onResult(async (result) => {
+  if (result.loading) return;
+  if (!result.data) {
+    errors.push(t("This URL is not supported"));
+    return;
+  }
+  const interact = result.data.interact;
   switch (interact.__typename) {
     case "Group":
       await router.replace({
diff --git a/lib/service/activity/participant.ex b/lib/service/activity/participant.ex
index 791e67fff..2a23bdc26 100644
--- a/lib/service/activity/participant.ex
+++ b/lib/service/activity/participant.ex
@@ -22,20 +22,25 @@ defmodule Mobilizon.Service.Activity.Participant do
     event = Events.get_event!(event_id)
     subject = Keyword.fetch!(options, :subject)
 
-    ActivityBuilder.enqueue(:build_activity, %{
-      "type" => "event",
-      "subject" => subject,
-      "subject_params" => %{
-        actor_name: Actor.display_name(actor),
-        event_title: event.title,
-        event_uuid: event.uuid
-      },
-      "group_id" => event.attributed_to_id,
-      "author_id" => actor.id,
-      "object_type" => "participant",
-      "object_id" => participant_id,
-      "inserted_at" => DateTime.utc_now()
-    })
+    if is_nil(event.attributed_to_id) do
+      # No activity for non-group events
+      {:ok, nil}
+    else
+      ActivityBuilder.enqueue(:build_activity, %{
+        "type" => "event",
+        "subject" => subject,
+        "subject_params" => %{
+          actor_name: Actor.display_name(actor),
+          event_title: event.title,
+          event_uuid: event.uuid
+        },
+        "group_id" => event.attributed_to_id,
+        "author_id" => actor.id,
+        "object_type" => "participant",
+        "object_id" => participant_id,
+        "inserted_at" => DateTime.utc_now()
+      })
+    end
   end
 
   @impl Activity
diff --git a/lib/service/actor_suspension.ex b/lib/service/actor_suspension.ex
index b5531a9d3..00062563e 100644
--- a/lib/service/actor_suspension.ex
+++ b/lib/service/actor_suspension.ex
@@ -103,7 +103,7 @@ defmodule Mobilizon.Service.ActorSuspension do
     end)
   end
 
-  defp maybe_reset_actor_id(%Multi{} = multi, %Actor{type: :Group} = _actor) do
+  defp maybe_reset_actor_id(%Multi{} = multi, %Actor{type: _} = _actor) do
     multi
   end