diff --git a/EveryThing/Pages/Projects/Edit.cshtml b/EveryThing/Pages/Projects/Edit.cshtml
index 1214ddf..9aa0b04 100644
--- a/EveryThing/Pages/Projects/Edit.cshtml
+++ b/EveryThing/Pages/Projects/Edit.cshtml
@@ -199,7 +199,7 @@
                                     <tbody>
                                     @foreach (var invoice in Model.Invoices.Where(x => x.Type == Models.Invoice.Invoice.InvoiceType.Order))
                                     {
-                                        <tr class="invoice-row" data-idparts="@string.Join(",", invoice.InvoiceInvoiceItem?.Select(x => x.ProjectPartItem.IdProjectPartFk) ?? Array.Empty<int>())">
+                                        <tr class="invoice-row" data-idparts="@string.Join(",", invoice.InvoiceInvoiceItem?.Select(x => x.ProjectPartItem?.IdProjectPartFk ?? 0) ?? Array.Empty<int>())">
                                             <td>
                                                 @Html.DisplayFor(modelItem => invoice.InvoiceYear) - @Html.DisplayFor(modelItem => invoice.InvoiceNumber)
                                             </td>
@@ -265,7 +265,7 @@
                                         <tbody>
                                             @foreach (var invoice in Model.Invoices.Where(x => x.Type == Models.Invoice.Invoice.InvoiceType.DeliveryNote))
                                             {
-                                                <tr class="invoice-row" data-idinvoice="@invoice.IdInvoice" data-idparts="@string.Join(",", invoice.InvoiceInvoiceItem?.Select(x => x.ProjectPartItem.IdProjectPartFk) ?? Array.Empty<int>())">
+                                                <tr class="invoice-row" data-idinvoice="@invoice.IdInvoice" data-idparts="@string.Join(",", invoice.InvoiceInvoiceItem?.Select(x => x.ProjectPartItem?.IdProjectPartFk ?? 0) ?? Array.Empty<int>())">
                                                     <td style="width: 20px;">
                                                         @if (invoice.State == Invoice.InvoiceState.Confirmed)
                                                         {
@@ -335,7 +335,7 @@
                                         <tbody>
                                             @foreach (var invoice in Model.Invoices.Where(x => x.Type == Models.Invoice.Invoice.InvoiceType.Invoice))
                                             {
-                                                <tr class="invoice-row" data-idinvoice="@invoice.IdInvoice" data-idparts="@string.Join(",", invoice.InvoiceInvoiceItem?.Select(x => x.ProjectPartItem.IdProjectPartFk) ?? Array.Empty<int>())">
+                                                <tr class="invoice-row" data-idinvoice="@invoice.IdInvoice" data-idparts="@string.Join(",", invoice.InvoiceInvoiceItem?.Select(x => x.ProjectPartItem?.IdProjectPartFk ?? 0) ?? Array.Empty<int>())">
                                                     <td>
                                                         @Html.DisplayFor(modelItem => invoice.InvoiceYear) - @Html.DisplayFor(modelItem => invoice.InvoiceNumber)
                                                     </td>
@@ -537,7 +537,7 @@
                                             <tbody>
                                                 @foreach (var invoice in Model.Invoices.Where(x => x.Type == Invoice.InvoiceType.Cooperation))
                                                 {
-                                                <tr class="invoice-row" data-idparts="@string.Join(",", invoice.InvoiceInvoiceItem?.Select(x => x.ProjectPartItem.IdProjectPartFk) ?? Array.Empty<int>())">
+                                                <tr class="invoice-row" data-idparts="@string.Join(",", invoice.InvoiceInvoiceItem?.Select(x => x.ProjectPartItem?.IdProjectPartFk ?? 0) ?? Array.Empty<int>())">
                                                         <td>
                                                             @Html.DisplayFor(modelItem => invoice.InvoiceYear) - @Html.DisplayFor(modelItem => invoice.InvoiceNumber)
                                                         </td>