diff --git a/src/Pickles/Pickles.UserInterface/MainWindowViewModel.cs b/src/Pickles/Pickles.UserInterface/MainWindowViewModel.cs
index e6ce85234..93d046f4e 100644
--- a/src/Pickles/Pickles.UserInterface/MainWindowViewModel.cs
+++ b/src/Pickles/Pickles.UserInterface/MainWindowViewModel.cs
@@ -454,7 +454,7 @@ private void MainWindowViewModel_PropertyChanged(object sender, PropertyChangedE
 
                 case "TestResultsFile":
                     {
-                        if (this.testResultsFile.Split(';').All(trf => this.fileSystem.File.Exists(trf)))
+                        if (this.testResultsFile == null || this.testResultsFile.Split(';').All(trf => this.fileSystem.File.Exists(trf)))
                         {
                             this.IsTestResultsFileValid = true;
                         }