diff --git a/src/Core/GitEventsMonitor.cs b/src/Core/GitEventsMonitor.cs
index 86dc2b4b2..15601acbc 100644
--- a/src/Core/GitEventsMonitor.cs
+++ b/src/Core/GitEventsMonitor.cs
@@ -73,7 +73,7 @@ private void HeadFileChanged(object sender, FileSystemEventArgs e)
         {
             HeadChanged?.BeginInvoke(this, EventArgs.Empty, new AsyncCallback((IAsyncResult ar) =>
             {
-                HeadChanged.EndInvoke(ar);
+                HeadChanged?.EndInvoke(ar);
             }), null);
         }