diff --git a/application/Espo/Modules/Crm/Entities/Document.php b/application/Espo/Modules/Crm/Entities/Document.php
index 86ef00bbc0..ea54ab25eb 100644
--- a/application/Espo/Modules/Crm/Entities/Document.php
+++ b/application/Espo/Modules/Crm/Entities/Document.php
@@ -32,6 +32,8 @@ namespace Espo\Modules\Crm\Entities;
 use Espo\Core\Field\Link;
 use Espo\Core\Field\LinkMultiple;
 use Espo\Core\ORM\Entity;
+use Espo\Entities\Attachment;
+use RuntimeException;
 
 class Document extends Entity
 {
@@ -50,6 +52,17 @@ class Document extends Entity
         return $this->get('fileId');
     }
 
+    public function getFile(): ?Attachment
+    {
+        $file = $this->relations->getOne('file');
+
+        if ($file && !$file instanceof Attachment) {
+            throw new RuntimeException();
+        }
+
+        return $file;
+    }
+
     public function getAssignedUser(): ?Link
     {
         /** @var ?Link */