diff --git a/libs/ardour/ardour/session_event.h b/libs/ardour/ardour/session_event.h
index b0af5596f6..9eeecb9a56 100644
--- a/libs/ardour/ardour/session_event.h
+++ b/libs/ardour/ardour/session_event.h
@@ -25,6 +25,7 @@
 #include <list>
 #include <boost/function.hpp>
 #include <boost/shared_ptr.hpp>
+#include <boost/weak_ptr.hpp>
 
 #include "pbd/pool.h"
 #include "pbd/ringbuffer.h"
@@ -86,7 +87,7 @@ public:
 		OverwriteReason  overwrite;
 	};
 
-	boost::shared_ptr<Track> track;
+	boost::weak_ptr<Track> track;
 
 	union {
 		bool second_yes_or_no;
diff --git a/libs/ardour/session_process.cc b/libs/ardour/session_process.cc
index ebdb02f2b2..bc8cb91a51 100644
--- a/libs/ardour/session_process.cc
+++ b/libs/ardour/session_process.cc
@@ -948,7 +948,9 @@ Session::process_event (SessionEvent* ev)
 		break;
 
 	case SessionEvent::Overwrite:
-		overwrite_some_buffers (ev->track, ev->overwrite);
+		if (boost::shared_ptr<Track> track = ev->track.lock()) {
+			overwrite_some_buffers (track, ev->overwrite);
+		}
 		break;
 
 	case SessionEvent::Audition: