ensure nodeview is unset when project closes

app/panel/node/node.h

@@ -35,6 +35,11 @@ class NodePanel : public PanelWidget
 public:
   NodePanel(QWidget* parent);
 
+  NodeGraph* GetGraph() const
+  {
+    return node_view_->GetGraph();
+  }
+
   void SetGraph(NodeGraph *graph)
   {
     node_view_->SetGraph(graph);

app/widget/nodeview/nodeview.h

@@ -46,6 +46,11 @@ public:
 
   virtual ~NodeView() override;
 
+  NodeGraph* GetGraph() const
+  {
+    return graph_;
+  }
+
   /**
    * @brief Sets the graph to view
    */

app/window/mainwindow/mainwindow.cpp

@@ -362,6 +362,11 @@ void MainWindow::ProjectClose(Project *p)
       RemoveProjectPanel(panel);
     }
   }
+
+  // Close project from NodeView
+  if (node_panel_->GetGraph() == p) {
+    node_panel_->SetGraph(nullptr);
+  }
 }
 
 void MainWindow::SetApplicationProgressStatus(ProgressStatus status)