diff --git a/src/CanKit.Pro.IsoTp/IsoTpChannel.cs b/src/CanKit.Pro.IsoTp/IsoTpChannel.cs
index 6c160366..32d5ae4e 100644
--- a/src/CanKit.Pro.IsoTp/IsoTpChannel.cs
+++ b/src/CanKit.Pro.IsoTp/IsoTpChannel.cs
@@ -262,8 +262,10 @@ internal IsoTpChannel(ICanBusService service, IsoTpEndpoint endpoint,
         }
         catch
         {
-            _actor.BackgroundExceptionOccurred -= OnActorBackgroundException;
+            // Unsubscribe only after an owned actor's Dispose, as the J1939 constructors do
+            // (#442): that is where the actor reports a callback that outlived its shutdown bound.
             if (_ownsActor) _actor.Dispose();
+            _actor.BackgroundExceptionOccurred -= OnActorBackgroundException;
             throw;
         }