diff --git a/src/Renci.SshNet/ForwardedPortDynamic.NET.cs b/src/Renci.SshNet/ForwardedPortDynamic.NET.cs
index 8acda487..fdf216a4 100644
--- a/src/Renci.SshNet/ForwardedPortDynamic.NET.cs
+++ b/src/Renci.SshNet/ForwardedPortDynamic.NET.cs
@@ -77,10 +77,11 @@ namespace Renci.SshNet
                     }
                     finally
                     {
-                        if (Session != null)
+                        var session = Session;
+                        if (session != null)
                         {
-                            Session.ErrorOccured -= Session_ErrorOccured;
-                            Session.Disconnected -= Session_Disconnected;
+                            session.ErrorOccured -= Session_ErrorOccured;
+                            session.Disconnected -= Session_Disconnected;
                         }
                     }
                 });
diff --git a/src/Renci.SshNet/ForwardedPortLocal.NET.cs b/src/Renci.SshNet/ForwardedPortLocal.NET.cs
index 010ce408..664a48c8 100644
--- a/src/Renci.SshNet/ForwardedPortLocal.NET.cs
+++ b/src/Renci.SshNet/ForwardedPortLocal.NET.cs
@@ -74,10 +74,11 @@ namespace Renci.SshNet
                     }
                     finally
                     {
-                        if (Session != null)
+                        var session = Session;
+                        if (session != null)
                         {
-                            Session.Disconnected -= Session_Disconnected;
-                            Session.ErrorOccured -= Session_ErrorOccured;
+                            session.Disconnected -= Session_Disconnected;
+                            session.ErrorOccured -= Session_ErrorOccured;
                         }
                     }
                 });
diff --git a/src/Renci.SshNet/ForwardedPortRemote.cs b/src/Renci.SshNet/ForwardedPortRemote.cs
index 643fdb19..1c6d7eea 100644
--- a/src/Renci.SshNet/ForwardedPortRemote.cs
+++ b/src/Renci.SshNet/ForwardedPortRemote.cs
@@ -308,10 +308,10 @@ namespace Renci.SshNet
                 var session = Session;
                 if (session != null)
                 {
+                    Session = null;
                     session.RequestSuccessReceived -= Session_RequestSuccess;
                     session.RequestFailureReceived -= Session_RequestFailure;
                     session.ChannelOpenReceived -= Session_ChannelOpening;
-                    Session = null;
                 }
 
                 var globalRequestResponse = _globalRequestResponse;