diff --git a/src/VSTOContrib.Core/RibbonFactory/RibbonFactoryController.cs b/src/VSTOContrib.Core/RibbonFactory/RibbonFactoryController.cs
index c53275f..a35d8f4 100644
--- a/src/VSTOContrib.Core/RibbonFactory/RibbonFactoryController.cs
+++ b/src/VSTOContrib.Core/RibbonFactory/RibbonFactoryController.cs
@@ -164,12 +164,12 @@ public void Invoke(IRibbonControl control, Expression<Action> caller, params obj
             {
                 var innerEx = e.InnerException;
                 PreserveStackTrace(innerEx);
-                if (vstoContribContext.ErrorHandlers.Count == 0)
+                if (vstoContribContext.ErrorHandlers != null && vstoContribContext.ErrorHandlers.Count == 0)
                 {
                     Trace.TraceError(innerEx.ToString());
                 }
 
-                var handled = vstoContribContext.ErrorHandlers.Any(errorHandler => errorHandler.Handle(innerEx));
+                var handled = vstoContribContext.ErrorHandlers != null && vstoContribContext.ErrorHandlers.Any(errorHandler => errorHandler.Handle(innerEx));
 
                 if (!handled)
                     throw innerEx;
@@ -213,4 +213,4 @@ public void Dispose()
             customTaskPaneRegister.Dispose();
         }
     }
-}
\ No newline at end of file
+}