diff --git a/modules/purchase_trade/party.py b/modules/purchase_trade/party.py
index b4cb2a2..ba0dddb 100755
--- a/modules/purchase_trade/party.py
+++ b/modules/purchase_trade/party.py
@@ -141,11 +141,12 @@ class Party(metaclass=PoolMeta):
     
     def get_sla_cost(self,location):
         if self.sla:
-            for sla in self.sla:
-                SlaPlace = Pool().get('party.execution.place')
-                sp = SlaPlace.search([('pes','=', sla.id),('location','=',location)])
-                if sp:
-                    return sp[0].cost,sp[0].mode,sp[0].currency,sp[0].unit
+            for sla in self.sla:
+                SlaPlace = Pool().get('party.execution.place')
+                sp = SlaPlace.search([('pes','=', sla.id),('location','=',location)])
+                if sp:
+                    return sp[0].cost,sp[0].mode,sp[0].currency,sp[0].unit
+        return None, None, None, None
     
     def get_alf(self):
         if self.name == 'CARGO CONTROL':
diff --git a/modules/purchase_trade/stock.py b/modules/purchase_trade/stock.py
index 0a9253c..2a4c259 100755
--- a/modules/purchase_trade/stock.py
+++ b/modules/purchase_trade/stock.py
@@ -799,23 +799,30 @@ class ShipmentIn(metaclass=PoolMeta):
         else:
             return str(self.id)
 
-    def create_fee(self,controller):
-        Fee = Pool().get('fee.fee')
-        Product = Pool().get('product.product')
-        fee = Fee()
-        fee.shipment_in = self.id
-        fee.supplier = controller
-        fee.type = 'budgeted'
-        fee.p_r = 'pay'
-        price,mode,curr,unit = controller.get_sla_cost(self.to_location)
-        if price and mode and curr and unit:
-            fee.mode = mode
-            fee.currency = curr
-            fee.unit = unit
-            fee.quantity = self.get_bales() or 1
-            fee.product = Product.get_by_name('Reweighing')
-            fee.price = price
-            Fee.save([fee])
+    def create_fee(self,controller):
+        Fee = Pool().get('fee.fee')
+        Product = Pool().get('product.product')
+        if not controller:
+            logger.info("CREATE_FEE_SKIPPED:NO_CONTROLLER shipment=%s", self)
+            return
+        fee = Fee()
+        fee.shipment_in = self.id
+        fee.supplier = controller
+        fee.type = 'budgeted'
+        fee.p_r = 'pay'
+        price,mode,curr,unit = controller.get_sla_cost(self.to_location)
+        if not (price and mode and curr and unit):
+            logger.info(
+                "CREATE_FEE_SKIPPED:NO_SLA shipment=%s controller=%s location=%s",
+                self, controller, self.to_location)
+            return
+        fee.mode = mode
+        fee.currency = curr
+        fee.unit = unit
+        fee.quantity = self.get_bales() or 1
+        fee.product = Product.get_by_name('Reweighing')
+        fee.price = price
+        Fee.save([fee])
 
     def get_controller(self):
         ControllerCategory = Pool().get('party.category')
diff --git a/modules/purchase_trade/tests/test_module.py b/modules/purchase_trade/tests/test_module.py
index 91bf0a3..f9d7f89 100644
--- a/modules/purchase_trade/tests/test_module.py
+++ b/modules/purchase_trade/tests/test_module.py
@@ -269,6 +269,40 @@ class PurchaseTradeTestCase(ModuleTestCase):
 
         self.assertEqual(line._get_linked_unit_factor(), Decimal('2'))
 
+    def test_get_sla_cost_returns_empty_tuple_when_no_place_matches(self):
+        'controller sla helper keeps a stable tuple contract when no sla rule matches'
+        Party = Pool().get('party.party')
+        party = Party()
+        party.sla = []
+
+        self.assertEqual(
+            party.get_sla_cost(Mock()),
+            (None, None, None, None))
+
+    def test_create_fee_skips_when_controller_has_no_sla_cost(self):
+        'shipment fee creation skips cleanly when controller has no matching sla'
+        ShipmentIn = Pool().get('stock.shipment.in')
+        shipment = ShipmentIn()
+        shipment.id = 99
+        shipment.to_location = Mock()
+        shipment.get_bales = Mock(return_value=Decimal('10'))
+        controller = Mock()
+        controller.get_sla_cost.return_value = (None, None, None, None)
+
+        fee_model = Mock()
+        product_model = Mock()
+
+        with patch('trytond.modules.purchase_trade.stock.Pool') as PoolMock:
+            PoolMock.return_value.get.side_effect = lambda name: {
+                'fee.fee': fee_model,
+                'product.product': product_model,
+            }[name]
+
+            shipment.create_fee(controller)
+
+        fee_model.save.assert_not_called()
+        product_model.get_by_name.assert_not_called()
+
     def test_purchase_line_default_pricing_rule_comes_from_configuration(self):
         'purchase line pricing_rule defaults to the purchase_trade singleton value'
         PurchaseLine = Pool().get('purchase.line')