diff --git a/core/models.py b/core/models.py
index 0182838..7519732 100644
--- a/core/models.py
+++ b/core/models.py
@@ -490,12 +490,12 @@ class OrderLine(models.Model):
         return self.quantity - self.quantity_fulfilled
 
     def minus_stock(self):
-        if self.variant.track_inventory:
+        if self.variant and self.variant.track_inventory:
             self.variant.stock -= self.quantity
             self.variant.save()
 
     def add_stock(self):
-        if self.variant.track_inventory:
+        if self.variant and self.variant.track_inventory:
             self.variant.stock += self.quantity
             self.variant.save()