diff --git a/RhSolutions.AddIn/Services/RhExcelReader.cs b/RhSolutions.AddIn/Services/RhExcelReader.cs
index e7ae342..0192b39 100644
--- a/RhSolutions.AddIn/Services/RhExcelReader.cs
+++ b/RhSolutions.AddIn/Services/RhExcelReader.cs
@@ -163,6 +163,6 @@ public class RhExcelReader : IExcelReader, IDisposable
 
     public void Dispose()
     {
-        _progressBar.Dispose();
+        _progressBar?.Dispose();
     }
 }
\ No newline at end of file