diff --git a/lib/federation/activity_stream/converter/event.ex b/lib/federation/activity_stream/converter/event.ex
index 2eca4e805..76e695383 100644
--- a/lib/federation/activity_stream/converter/event.ex
+++ b/lib/federation/activity_stream/converter/event.ex
@@ -198,6 +198,8 @@ defmodule Mobilizon.Federation.ActivityStream.Converter.Event do
 
   defp calculate_timezone(_object, nil), do: nil
 
+  defp calculate_timezone(_object, %Address{geom: nil}), do: nil
+
   defp calculate_timezone(_object, %Address{geom: geom}) do
     TimezoneDetector.detect(
       nil,