1 files changed, 9 insertions, 2 deletions
diff --git a/Software/Visual_Studio/MachineStudio/Modules/Tango.MachineStudio.Developer/Converters/LiquidVolumesToLubricantLiquidVolume.cs b/Software/Visual_Studio/MachineStudio/Modules/Tango.MachineStudio.Developer/Converters/LiquidVolumesToLubricantLiquidVolume.cs
index e59141e7f..5939bfd53 100644
--- a/Software/Visual_Studio/MachineStudio/Modules/Tango.MachineStudio.Developer/Converters/LiquidVolumesToLubricantLiquidVolume.cs
+++ b/Software/Visual_Studio/MachineStudio/Modules/Tango.MachineStudio.Developer/Converters/LiquidVolumesToLubricantLiquidVolume.cs
@@ -14,8 +14,15 @@ namespace Tango.MachineStudio.Developer.Converters
     {
         public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
         {
-            IEnumerable<LiquidVolume> liquid_volumes = value as IEnumerable<LiquidVolume>;
-            return liquid_volumes.SingleOrDefault(x => x.IdsPack.IdsPackFormula.Code == IdsPackFormulas.Lubricant.ToInt32());
+            if (value != null)
+            {
+                IEnumerable<LiquidVolume> liquid_volumes = value as IEnumerable<LiquidVolume>;
+                return liquid_volumes.SingleOrDefault(x => x.IdsPack.IdsPackFormula.Code == IdsPackFormulas.Lubricant.ToInt32());
+            }
+            else
+            {
+                return null;
+            }
         }
 
         public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)