Added a null reference check

PROMS/Volian.Controls.Library/MostRecentItem.cs

@@ -198,6 +198,7 @@ namespace Volian.Controls.Library
 		{
 			using (ItemInfo itm = ItemInfo.Get(itemId))
 			{
+				if (itm == null) return null;
 				if (itm.IsProcedure) return ProcedureInfo.Get(itemId);
 				if (itm.IsSection) return SectionInfo.Get(itemId);
 				if (itm.IsStep) return StepInfo.Get(itemId);