diff --git a/easy_my_coop/models/partner.py b/easy_my_coop/models/partner.py
index f579766..b4b1752 100644
--- a/easy_my_coop/models/partner.py
+++ b/easy_my_coop/models/partner.py
@@ -211,9 +211,14 @@ class ResPartner(models.Model):
         )
 
     def get_cooperator_from_crn(self, company_register_number):
-        return self.env["res.partner"].search(
-            [
-                ("cooperator", "=", True),
-                ("company_register_number", "=", company_register_number),
-            ]
-        )
+        company_register_number = company_register_number.strip()
+        if company_register_number:
+            partner = self.env["res.partner"].search(
+                [
+                    ("cooperator", "=", True),
+                    ("company_register_number", "=", company_register_number),
+                ]
+            )
+        else:
+            partner = None
+        return partner
diff --git a/easy_my_coop/views/account_invoice_view.xml b/easy_my_coop/views/account_invoice_view.xml
index d248b8d..8398480 100644
--- a/easy_my_coop/views/account_invoice_view.xml
+++ b/easy_my_coop/views/account_invoice_view.xml
@@ -14,8 +14,7 @@
         <field name="name">Cooperator Invoices</field>
         <field name="res_model">account.invoice</field>
         <field name="view_type">form</field>
-        <field name="view_mode">tree,kanban,form,calendar,pivot,graph,activity
-        </field>
+        <field name="view_mode">tree,kanban,form,calendar,pivot,graph,activity</field>
         <field eval="False" name="view_id"/>
         <field name="domain">[('type','in',('out_invoice',
             'out_refund')),('release_capital_request','=',True)]
@@ -53,8 +52,7 @@
         <field name="name">Customer Invoices</field>
         <field name="res_model">account.invoice</field>
         <field name="view_type">form</field>
-        <field name="view_mode">tree,kanban,form,calendar,pivot,graph,activity
-        </field>
+        <field name="view_mode">tree,kanban,form,calendar,pivot,graph,activity</field>
         <field eval="False" name="view_id"/>
         <field name="domain">[('type','in',('out_invoice',
             'out_refund')),('release_capital_request','=',False)]
diff --git a/easy_my_coop_website/controllers/main.py b/easy_my_coop_website/controllers/main.py
index 60bff75..ce8ff2e 100644
--- a/easy_my_coop_website/controllers/main.py
+++ b/easy_my_coop_website/controllers/main.py
@@ -329,12 +329,13 @@ class WebsiteSubscription(http.Controller):
                 return request.render(redirect, values)
 
         iban = kwargs.get("iban")
-        valid = sub_req_obj.check_iban(iban)
+        if iban.strip():
+            valid = sub_req_obj.check_iban(iban)
 
-        if not valid:
-            values = self.fill_values(values, is_company, logged)
-            values["error_msg"] = _("You iban account number" "is not valid")
-            return request.render(redirect, values)
+            if not valid:
+                values = self.fill_values(values, is_company, logged)
+                values["error_msg"] = _("You iban account number is not valid")
+                return request.render(redirect, values)
 
         # check the subscription's amount
         max_amount = company.subscription_maximum_amount