diff --git a/internal/modules/purchases/repositories/purchase.repository.go b/internal/modules/purchases/repositories/purchase.repository.go
index 2f5818c4..9fdc9ebf 100644
--- a/internal/modules/purchases/repositories/purchase.repository.go
+++ b/internal/modules/purchases/repositories/purchase.repository.go
@@ -248,7 +248,7 @@ func (r *PurchaseRepositoryImpl) UpdateReceivingDetails(
 		if upd.VehicleNumber != nil {
 			data["vehicle_number"] = upd.VehicleNumber
 		} else if upd.ClearVehicleNumber {
-			data["vehicle_number"] = gorm.Expr("NULL")
+			data["vehicle_number"] = ""
 		}
 		if upd.WarehouseID != nil && *upd.WarehouseID != 0 {
 			data["warehouse_id"] = upd.WarehouseID