diff --git a/vst/SfizzVstEditor.cpp b/vst/SfizzVstEditor.cpp
index 0f9bd231..e972b9bf 100644
--- a/vst/SfizzVstEditor.cpp
+++ b/vst/SfizzVstEditor.cpp
@@ -79,6 +79,7 @@ void PLUGIN_API SfizzVstEditor::close()
             frame->forget();
         else
             frame->close();
+        this->frame = nullptr;
     }
 }