Index: DamEngine/trunk/src/Deltares.DamEngine.TestHelpers/GeneralHelper.cs
===================================================================
diff -u -r6543 -r6573
--- DamEngine/trunk/src/Deltares.DamEngine.TestHelpers/GeneralHelper.cs	(.../GeneralHelper.cs)	(revision 6543)
+++ DamEngine/trunk/src/Deltares.DamEngine.TestHelpers/GeneralHelper.cs	(.../GeneralHelper.cs)	(revision 6573)
@@ -219,7 +219,7 @@
                 string fileName = calculationResult.BaseFileName;
                 // Note: only check for the iterated file if the design calculation was successful 
                 isIteratedFilePresent = isIteratedFilePresent ||
-                                        (!fileName.IsNullOrEmpty() && fileName.Contains("Ite(") && !fileName.Contains("Ite(1)"))
+                                        (!string.IsNullOrEmpty(fileName) && fileName.Contains("Ite(") && !fileName.Contains("Ite(1)"))
                                         || !isDesignSuccessful;
             }