diff --git a/addons/account_edi_ubl_cii/models/account_edi_common.py b/addons/account_edi_ubl_cii/models/account_edi_common.py
index debb438ad37..ce830396e3e 100644
--- a/addons/account_edi_ubl_cii/models/account_edi_common.py
+++ b/addons/account_edi_ubl_cii/models/account_edi_common.py
@@ -131,7 +131,7 @@ class AccountEdiCommon(models.AbstractModel):
         # add Norway, Iceland, Liechtenstein
         european_economic_area = self.env.ref('base.europe').country_ids.mapped('code') + ['NO', 'IS', 'LI']
 
-        if customer.country_id.code == 'ES':
+        if customer.country_id.code == 'ES' and customer.zip:
             if customer.zip[:2] in ('35', '38'):  # Canary
                 # [BR-IG-10]-A VAT breakdown (BG-23) with VAT Category code (BT-118) "IGIC" shall not have a VAT
                 # exemption reason code (BT-121) or VAT exemption reason text (BT-120).