diff --git a/application/Espo/Tools/EmailTemplate/Processor.php b/application/Espo/Tools/EmailTemplate/Processor.php
index 5553d76d76..71f9847df9 100644
--- a/application/Espo/Tools/EmailTemplate/Processor.php
+++ b/application/Espo/Tools/EmailTemplate/Processor.php
@@ -245,6 +245,7 @@ class Processor
                 !in_array($entity->getRelationType($relation), [
                     Entity::BELONGS_TO,
                     Entity::BELONGS_TO_PARENT,
+                    Entity::HAS_ONE,
                 ])
             ) {
                 continue;