diff --git a/lib/trento_web/openapi/v1/schema/discovery_event.ex b/lib/trento_web/openapi/v1/schema/discovery_event.ex
index 0ef0b78f49..ea1365a4b1 100644
--- a/lib/trento_web/openapi/v1/schema/discovery_event.ex
+++ b/lib/trento_web/openapi/v1/schema/discovery_event.ex
@@ -14,6 +14,7 @@ defmodule TrentoWeb.OpenApi.V1.Schema.DiscoveryEvent do
       agent_id: %Schema{type: :string, format: :uuid},
       discovery_type: %Schema{type: :string},
       payload: %Schema{
+        nullable: true,
         oneOf: [%Schema{type: :object}, %Schema{type: :array}]
       }
     },
diff --git a/test/trento_web/controllers/v1/discovery_controller_test.exs b/test/trento_web/controllers/v1/discovery_controller_test.exs
index 9fb466d5a5..91c63c7231 100644
--- a/test/trento_web/controllers/v1/discovery_controller_test.exs
+++ b/test/trento_web/controllers/v1/discovery_controller_test.exs
@@ -20,5 +20,17 @@ defmodule TrentoWeb.V1.DiscoveryControllerTest do
                ]
              } = resp
     end
+
+    test "collect action should accept nil payloads",
+         %{conn: conn} do
+      conn
+      |> put_req_header("content-type", "application/json")
+      |> post("/api/v1/collect", %{
+        "discovery_type" => "ha_cluster_discovery",
+        "agent_id" => UUID.uuid4(),
+        "payload" => nil
+      })
+      |> json_response(202)
+    end
   end
 end