diff --git a/src/graphics/trainWindow/TrainWindow.ts b/src/graphics/trainWindow/TrainWindow.ts
index b7dd4c6..d149566 100644
--- a/src/graphics/trainWindow/TrainWindow.ts
+++ b/src/graphics/trainWindow/TrainWindow.ts
@@ -59,12 +59,14 @@ export class TrainWindow extends JlGraphic {
   }
   loadRealtions(): void {
     const sectionId = this.datas.sectionId;
-    const section = this.queryStore.queryById<Section>(sectionId);
-    if (section) {
-      this.relationManage.addRelation(
-        this,
-        new GraphicRelationParam(section, section.datas.id)
-      );
+    if (sectionId) {
+      const section = this.queryStore.queryById<Section>(sectionId);
+      if (section) {
+        this.relationManage.addRelation(
+          this,
+          new GraphicRelationParam(section, section.datas.id)
+        );
+      }
     }
   }
   getRelatedSections(): Section[] {
diff --git a/src/graphics/trainWindow/TrainWindowDrawAssistant.ts b/src/graphics/trainWindow/TrainWindowDrawAssistant.ts
index c11c593..7ef5740 100644
--- a/src/graphics/trainWindow/TrainWindowDrawAssistant.ts
+++ b/src/graphics/trainWindow/TrainWindowDrawAssistant.ts
@@ -171,7 +171,6 @@ function buildAbsorbablePositions(
 
 export class TrainWindowInteraction extends GraphicInteractionPlugin<TrainWindow> {
   static Name = 'TrainWindow_transform';
-  static trainWindow: TrainWindow;
   constructor(app: JlDrawApp) {
     super(TrainWindowInteraction.Name, app);
   }
@@ -184,7 +183,6 @@ export class TrainWindowInteraction extends GraphicInteractionPlugin<TrainWindow
       .map((g) => g as TrainWindow);
   }
   bind(g: TrainWindow): void {
-    TrainWindowInteraction.trainWindow = g;
     g.eventMode = 'static';
     g.cursor = 'pointer';
     g.scalable = true;
@@ -199,10 +197,9 @@ export class TrainWindowInteraction extends GraphicInteractionPlugin<TrainWindow
     g.off('selected', this.onSelected, this);
   }
   onSelected(): void {
+    const trainWindow = this.app.selectedGraphics[0] as TrainWindow;
     this.app.setOptions({
-      absorbablePositions: buildAbsorbablePositions(
-        TrainWindowInteraction.trainWindow
-      ),
+      absorbablePositions: buildAbsorbablePositions(trainWindow),
     });
   }
 }