diff --git a/app/node/output/viewer/viewer.cpp b/app/node/output/viewer/viewer.cpp
index b4f4b8abb..0b70b65a6 100644
--- a/app/node/output/viewer/viewer.cpp
+++ b/app/node/output/viewer/viewer.cpp
@@ -52,7 +52,10 @@ ViewerOutput::ViewerOutput() :
 
 ViewerOutput::~ViewerOutput()
 {
+  // Should prevent traversing graph unnecessarily
+  BeginOperation();
   DisconnectAll();
+  EndOperation();
 }
 
 Node *ViewerOutput::copy() const
diff --git a/app/project/item/sequence/sequence.cpp b/app/project/item/sequence/sequence.cpp
index beb5da7d3..1203b6427 100644
--- a/app/project/item/sequence/sequence.cpp
+++ b/app/project/item/sequence/sequence.cpp
@@ -55,7 +55,10 @@ Sequence::Sequence()
 
 Sequence::~Sequence()
 {
+  // Should prevent traversing graph unnecessarily
+  BeginOperation();
   DisconnectAll();
+  EndOperation();
 }
 
 void Sequence::add_default_nodes(MultiUndoCommand* command)