diff --git a/app/controllers/register_attendances_controller.rb b/app/controllers/register_attendances_controller.rb
index c536c88bc..8af24d97f 100644
--- a/app/controllers/register_attendances_controller.rb
+++ b/app/controllers/register_attendances_controller.rb
@@ -56,6 +56,7 @@ def set_patient_sessions
         .where
         .missing(:session_attendances)
         .or(ps.where.not(session_attendances: { session_date: @session_date }))
+        .to_a
   end
 
   def set_patient