diff --git a/allow_none_list_price.diff b/allow_none_list_price.diff
new file mode 100644
index 0000000..ef8e84d
--- /dev/null
+++ b/allow_none_list_price.diff
@@ -0,0 +1,13 @@
+diff --git a/product.py b/product.py
+index edb0f67..dcb0197 100644
+--- a/trytond/trytond/modules/sale_price_list/product.py
++++ b/trytond/trytond/modules/sale_price_list/product.py
+@@ -37,7 +37,7 @@ class Product(metaclass=PoolMeta):
+                 uom = self.sale_uom
+             unit_price = price_list.compute(
+                  customer, self, unit_price, quantity, uom)
+-            if price_list.tax_included and taxes:
++            if price_list.tax_included and taxes and unit_price is not None:
+                 unit_price = Tax.reverse_compute(unit_price, taxes)
+         return unit_price
+ 
diff --git a/series b/series
index 9d6d269..599c330 100644
--- a/series
+++ b/series
@@ -64,3 +64,5 @@ issue11181.diff # [stock] Require unit price also for view location like for sto
 issue11745.diff # [stock] Moves of internal shipment are not valid when switching between transit and no transit
 
 issue11750.diff # [stock] 'create' method execution frozen or extremly slow
+
+allow_none_list_price.diff # [sale_price_list] allow set none as price list in a sale with tax_included=True product_price_list
\ No newline at end of file