diff --git a/AlgebraicDataflowArchitectureModel/src/application/editor/stages/DependencyModelingStage.java b/AlgebraicDataflowArchitectureModel/src/application/editor/stages/DependencyModelingStage.java
index 810cad2..6a90bf9 100644
--- a/AlgebraicDataflowArchitectureModel/src/application/editor/stages/DependencyModelingStage.java
+++ b/AlgebraicDataflowArchitectureModel/src/application/editor/stages/DependencyModelingStage.java
@@ -31,7 +31,6 @@
 
     private DependencyGraph dependencyGraph = null;
 
-    private HashMap<ResourceNode, mxCell> resNodeToCell;
     private HashMap<StatefulObjectNode, mxCell> statefulObjectNodeToCell;
     private HashMap<EventChannelObjectNode, mxCell> eventChannelObjNodeToCell;
     private HashMap<mxCell, InterfaceNode> cellToInterfaceNode = new HashMap<>();
@@ -72,7 +71,6 @@
             ControlFlowGraph controlFlowGraph = new ControlFlowGraph(dataFlowGraph, model);
             dependencyGraph = new DependencyGraph(controlFlowGraph, model);
 
-            resNodeToCell = ((PushPullSelectionStage) prevStage).getResNodeToCell();
             statefulObjectNodeToCell = buildStatefulObjectNodeMap(prevStage);
             eventChannelObjNodeToCell =  buildEventChannelObjNodeMap(prevStage);
 
@@ -119,14 +117,11 @@
             rootMap.put(root.getResource(), root);
         }
 
-        for (ResourceNode node : resNodeToCell.keySet()) {
-            mxCell cell = ((PushPullSelectionStage) prevStage)
-                    .getResNodeToCell()
-                    .get(node);
+        for (ResourceNode node : ((PushPullSelectionStage) prevStage).getResNodeToCell().keySet()) {
+            mxCell cell = ((PushPullSelectionStage) prevStage).getResNodeToCell().get(node);
 
             if (cell == null) continue;
 
-            // root にあればそれを使う、なければ new
             StatefulObjectNode stateful =
                     rootMap.getOrDefault(node, new StatefulObjectNode(node));
             result.put(stateful, cell);