diff --git a/lib/solid_queue/processes/registrable.rb b/lib/solid_queue/processes/registrable.rb
index c7428010..cd7769da 100644
--- a/lib/solid_queue/processes/registrable.rb
+++ b/lib/solid_queue/processes/registrable.rb
@@ -54,7 +54,7 @@ def stop_heartbeat
       end
 
       def heartbeat
-        process.heartbeat
+        process&.heartbeat
       rescue ActiveRecord::RecordNotFound
         self.process = nil
         wake_up