Fix https://github.com/btcpayserver/btcpayserver/issues/585

BTCPayServer/BTCPayServer.csproj

@@ -2,7 +2,7 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <TargetFramework>netcoreapp2.1</TargetFramework>
-		<Version>1.0.3.57</Version>
+		<Version>1.0.3.59</Version>
     <NoWarn>NU1701,CA1816,CA1308,CA1810,CA2208</NoWarn>
   </PropertyGroup>
   <PropertyGroup>
@@ -33,7 +33,7 @@
     <EmbeddedResource Include="Currencies.txt" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="BTCPayServer.Lightning.All" Version="1.1.0.5" />
+    <PackageReference Include="BTCPayServer.Lightning.All" Version="1.1.0.9" />
     <PackageReference Include="BuildBundlerMinifier" Version="2.7.385" />
     <PackageReference Include="DigitalRuby.ExchangeSharp" Version="0.5.3" />
     <PackageReference Include="HtmlSanitizer" Version="4.0.199" />

BTCPayServer/Controllers/InvoiceController.cs

@@ -102,18 +102,17 @@ namespace BTCPayServer.Controllers
                 entity.RefundMail = entity.BuyerInformation.BuyerEmail;
             }
 
-            if (invoice.TaxIncluded is decimal taxIncluded)
+            var taxIncluded = invoice.TaxIncluded.HasValue ? invoice.TaxIncluded.Value : 0m;
+            
+            var currencyInfo = _CurrencyNameTable.GetNumberFormatInfo(invoice.Currency, false);
+            if (currencyInfo != null)
             {
-                var currencyInfo = _CurrencyNameTable.GetNumberFormatInfo(invoice.Currency, false);
-                if (currencyInfo != null)
-                {
-                    invoice.Price = Math.Round(invoice.Price, currencyInfo.CurrencyDecimalDigits);
-                    invoice.TaxIncluded = Math.Round(taxIncluded, currencyInfo.CurrencyDecimalDigits);
-                }
-                invoice.Price = Math.Max(0.0m, invoice.Price);
-                invoice.TaxIncluded = Math.Max(0.0m, taxIncluded);
-                invoice.TaxIncluded = Math.Min(taxIncluded, invoice.Price);
+                invoice.Price = Math.Round(invoice.Price, currencyInfo.CurrencyDecimalDigits);
+                invoice.TaxIncluded = Math.Round(taxIncluded, currencyInfo.CurrencyDecimalDigits);
             }
+            invoice.Price = Math.Max(0.0m, invoice.Price);
+            invoice.TaxIncluded = Math.Max(0.0m, taxIncluded);
+            invoice.TaxIncluded = Math.Min(taxIncluded, invoice.Price);
 
             entity.ProductInformation = Map<CreateInvoiceRequest, ProductInformation>(invoice);