PROMS/Volian.Print.Library/VlnSvgPageHelper.cs

@@ -196,6 +196,7 @@ namespace Volian.Print.Library
 		}
 		public void AddChangeBar(vlnChangeBar vcb, string cbmess)
 		{
+			if (vcb == null) return;
 			vlnChangeBar prevCB = null;
 			foreach (vlnChangeBar cb in MyChangeBars)
 			{