diff --git a/issue8751.diff b/issue8751.diff
new file mode 100644
index 0000000..cac28c9
--- /dev/null
+++ b/issue8751.diff
@@ -0,0 +1,33 @@
+diff -r e4d3be431517 trytond/trytond/modules/commission/commission.py
+--- a/trytond/trytond/modules/commission/commission.py	Mon May 06 15:01:46 2019 +0200
++++ b/trytond/trytond/modules/commission/commission.py	Thu Oct 24 15:38:16 2019 +0200
+@@ -37,13 +37,8 @@
+             ('principal', 'Principal Of'),
+             ], 'Type')
+     company = fields.Many2One('company.company', 'Company', required=True)
+-    plan = fields.Many2One('commission.plan', 'Plan')
+-    currency = fields.Many2One('currency.currency', 'Currency',
+-        states={
+-            'required': Bool(Eval('plan')),
+-            'invisible': ~Eval('plan'),
+-            },
+-        depends=['plan'])
++    plan = fields.Many2One('commission.plan', 'Plan', required=True)
++    currency = fields.Many2One('currency.currency', 'Currency', required=True)
+     pending_amount = fields.Function(fields.Numeric('Pending Amount',
+             digits=price_digits), 'get_pending_amount')
+
+@@ -55,6 +50,13 @@
+     def default_type_():
+         return 'agent'
+
++    @staticmethod
++    def default_currency():
++        Company = Pool().get('company.company')
++        company = Transaction().context.get('company')
++        if company:
++            return Company(company).currency.id
++
+     @fields.depends('company', 'currency')
+     def on_change_company(self):
+         if self.company and not self.currency:
diff --git a/series b/series
index 98dcadf..f5da7c7 100644
--- a/series
+++ b/series
@@ -23,6 +23,8 @@ issue8252.diff # [account_tax_rule_country] Add subdivisiions to match account t
 issue4030.diff # [analytic_account] Not selected root accounts in analytic account lines
 analitic_line_company_rules.diff # [analytic_account] Not selected root accounts in analytic account lines
 
+issue8751.diff # [commission] Not create agent without plan
+
 sale_list_price.diff # [sale] Can't convert to currency with list price is null (multicompany)
 sale_supply_supply_on_sale_multivalue.diff # [sale_supply] supply_on_sale field multvalue #035100
 sale_remove_multiselection.diff # [sale] remove multiselection handling exceptions