Index: DamTools/LayerOnSlopeTool/trunk/src/Deltares.LayerOnSlopeTool.StiFileCreator/DGSMStabDAMInterface.cs
===================================================================
diff -u -r3101 -r3109
--- DamTools/LayerOnSlopeTool/trunk/src/Deltares.LayerOnSlopeTool.StiFileCreator/DGSMStabDAMInterface.cs	(.../DGSMStabDAMInterface.cs)	(revision 3101)
+++ DamTools/LayerOnSlopeTool/trunk/src/Deltares.LayerOnSlopeTool.StiFileCreator/DGSMStabDAMInterface.cs	(.../DGSMStabDAMInterface.cs)	(revision 3109)
@@ -53,8 +53,15 @@
         public new string GetDllVersion()
         {
             DllVersionInfoStructure dllInfo;
-            DllGetVersion(out dllInfo);
-            return string.Format("{0}.{1}.{2}", dllInfo.DwMajorVersion, dllInfo.DwMinorVersion, dllInfo.DwBuildNumber);
+            var result = DllGetVersion(out dllInfo);
+            if (result == DllErrorNone)
+            {
+                return string.Format("{0}.{1}.{2}", dllInfo.DwMajorVersion, dllInfo.DwMinorVersion, dllInfo.DwBuildNumber);
+            }
+            else
+            {
+                return "Unknown";
+            }
         }
 
         /// <summary>