diff --git a/addons/repair/models/repair.py b/addons/repair/models/repair.py
index 25443b46ce8..62b798c0081 100644
--- a/addons/repair/models/repair.py
+++ b/addons/repair/models/repair.py
@@ -3,9 +3,11 @@
 from collections import defaultdict
 from random import randint
 
+from markupsafe import Markup
+
 from odoo import api, fields, models, _
 from odoo.exceptions import UserError, ValidationError
-from odoo.tools import float_compare
+from odoo.tools import float_compare, is_html_empty
 
 
 class StockMove(models.Model):
@@ -344,7 +346,7 @@ class Repair(models.Model):
                     'partner_id': partner_invoice.id,
                     'partner_shipping_id': repair.address_id.id,
                     'currency_id': currency.id,
-                    'narration': narration,
+                    'narration': narration if not is_html_empty(narration) else '',
                     'invoice_origin': repair.name,
                     'repair_ids': [(4, repair.id)],
                     'invoice_line_ids': [],
@@ -358,10 +360,11 @@ class Repair(models.Model):
                 invoice_vals = current_invoices_list[0]
                 invoice_vals['invoice_origin'] += ', ' + repair.name
                 invoice_vals['repair_ids'].append((4, repair.id))
-                if not invoice_vals['narration']:
-                    invoice_vals['narration'] = narration
-                else:
-                    invoice_vals['narration'] += '<br/>' + narration
+                if not is_html_empty(narration):
+                    if  is_html_empty(invoice_vals['narration']):
+                        invoice_vals['narration'] = narration
+                    else:
+                        invoice_vals['narration'] += Markup('<br/>') + narration
 
             # Create invoice lines from operations.
             for operation in repair.operations.filtered(lambda op: op.type == 'add'):