diff --git a/app/panel/scope/scope.cpp b/app/panel/scope/scope.cpp
index d61f7fa72..05560fe8b 100644
--- a/app/panel/scope/scope.cpp
+++ b/app/panel/scope/scope.cpp
@@ -106,6 +106,9 @@ void ScopePanel::SetViewerPanel(ViewerPanelBase *vp)
     SetColorManager(viewer_->GetColorManager());
 
     viewer_->UpdateTextureFromNode();
+  } else {
+    SetReferenceBuffer(nullptr);
+    SetColorManager(nullptr);
   }
 }