diff --git a/frappe/modules/utils.py b/frappe/modules/utils.py
index 528ca6e88b..bba2f62856 100644
--- a/frappe/modules/utils.py
+++ b/frappe/modules/utils.py
@@ -242,7 +242,7 @@ def make_boilerplate(template, doc, opts=None):
 
 		base_class = 'Document'
 		base_class_import = 'from frappe.model.document import Document'
-		if doc.is_tree:
+		if doc.get('is_tree'):
 			base_class = 'NestedSet'
 			base_class_import = 'from frappe.utils.nestedset import NestedSet'