diff --git a/PrintLevelWizard.cs b/PrintLevelWizard.cs
index 60bd882a9..ea16d2a88 100644
--- a/PrintLevelWizard.cs
+++ b/PrintLevelWizard.cs
@@ -373,6 +373,11 @@ namespace MatterHackers.MatterControl
         }
 
         void DoneButton_Click(object sender, MouseEventArgs mouseEvent)
+        {
+            UiThread.RunOnIdle(DoDoneButton_Click);
+        }
+
+        void DoDoneButton_Click(object state)
         {
             Close();
         }