diff --git a/ENI2/DetailViewControls/WasteDetailControl.xaml.cs b/ENI2/DetailViewControls/WasteDetailControl.xaml.cs
index 27c38c04..3ade16f5 100644
--- a/ENI2/DetailViewControls/WasteDetailControl.xaml.cs
+++ b/ENI2/DetailViewControls/WasteDetailControl.xaml.cs
@@ -302,7 +302,7 @@ namespace ENI2.DetailViewControls
             ewrd.AddClicked += () =>
             {
                 ewrd.CopyValuesToEntity();
-                if (!this._selectedWAS_RCPT.WasteReceived.Any(wr => wr.WasteCode == ewrd.WasteReceived.WasteCode))
+                if ((ewrd.WasteReceived.WasteCode != null) && !this._selectedWAS_RCPT.WasteReceived.Any(wr => wr.WasteCode == ewrd.WasteReceived.WasteCode))
                 {
                     this._selectedWAS_RCPT.WasteReceived.Add(ewrd.WasteReceived);
                     this.dataGridWasteReceived.Items.Refresh();
@@ -315,7 +315,7 @@ namespace ENI2.DetailViewControls
 
             if (ewrd.ShowDialog() ?? false)
             {
-                if (!this._selectedWAS_RCPT.WasteReceived.Any(wr => wr.WasteCode == ewrd.WasteReceived.WasteCode))
+                if ((ewrd.WasteReceived.WasteCode != null) && !this._selectedWAS_RCPT.WasteReceived.Any(wr => wr.WasteCode == ewrd.WasteReceived.WasteCode))
                 {
                     this._selectedWAS_RCPT.WasteReceived.Add(ewrd.WasteReceived);
                     this.dataGridWasteReceived.Items.Refresh();
@@ -333,7 +333,7 @@ namespace ENI2.DetailViewControls
             ewrd.AddClicked += () =>
             {
                 ewrd.CopyValuesToEntity();
-                if (!this._selectedWAS_RCPT.WasteReceived.Any(wr => wr.WasteCode == ewrd.WasteReceived.WasteCode))
+                if ((ewrd.WasteReceived.WasteCode != null) && !this._selectedWAS_RCPT.WasteReceived.Any(wr => wr.WasteCode == ewrd.WasteReceived.WasteCode))
                 {
                     _selectedWAS_RCPT.WasteReceived.Add(ewrd.WasteReceived);
                     this.dataGridWasteReceived.Items.Refresh();
@@ -346,9 +346,9 @@ namespace ENI2.DetailViewControls
 
             if (ewrd.ShowDialog() ?? false)
             {
-                if (!_selectedWAS_RCPT.WasteReceived.Any(wr => wr.WasteCode == ewrd.WasteReceived.WasteCode))
+                if ((ewrd.WasteReceived.WasteCode != null) && !_selectedWAS_RCPT.WasteReceived.Any(wr => wr.WasteCode == ewrd.WasteReceived.WasteCode))
                 {
-                    _selectedWAS_RCPT.WasteReceived.Add(ewrd.WasteReceived);                    
+                    _selectedWAS_RCPT.WasteReceived.Add(ewrd.WasteReceived);
                 }
                 this.dataGridWasteReceived.Items.Refresh();
                 this.SublistElementChanged(Message.NotificationClass.WAS_RCPT);