diff --git a/CHANGELOG.md b/CHANGELOG.md
index 84e34c9..30b1b5b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+## 0.2.2+1
+- fix: graph crash, when there is no panelBuilder.
+
 ## 0.2.2
 - fix: [#6](https://github.com/graph-cn/flutter_graph_view/issues/6)
     - change the loading timing of the panel to be at the same time as vertex/edge components loading.
diff --git a/example/pubspec.lock b/example/pubspec.lock
index f2d5ea1..e976be3 100644
--- a/example/pubspec.lock
+++ b/example/pubspec.lock
@@ -76,7 +76,7 @@ packages:
       path: ".."
       relative: true
     source: path
-    version: "0.2.1"
+    version: "0.2.2"
   flutter_lints:
     dependency: "direct dev"
     description:
@@ -90,22 +90,6 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
-  leak_tracker:
-    dependency: transitive
-    description:
-      name: leak_tracker
-      sha256: "04be76c4a4bb50f14904e64749237e541e7c7bcf7ec0b196907322ab5d2fc739"
-      url: "https://pub.dev"
-    source: hosted
-    version: "9.0.16"
-  leak_tracker_testing:
-    dependency: transitive
-    description:
-      name: leak_tracker_testing
-      sha256: b06739349ec2477e943055aea30172c5c7000225f79dad4702e2ec0eda79a6ff
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.0.5"
   lints:
     dependency: transitive
     description:
@@ -126,18 +110,18 @@ packages:
     dependency: transitive
     description:
       name: material_color_utilities
-      sha256: "0e0a020085b65b6083975e499759762399b4475f766c21668c4ecca34ea74e5a"
+      sha256: "9528f2f296073ff54cb9fee677df673ace1218163c3bc7628093e7eed5203d41"
       url: "https://pub.dev"
     source: hosted
-    version: "0.8.0"
+    version: "0.5.0"
   meta:
     dependency: transitive
     description:
       name: meta
-      sha256: d584fa6707a52763a52446f02cc621b077888fb63b93bbcb1143a7be5a0c0c04
+      sha256: a6e590c838b18133bb482a2745ad77c5bb7715fb0451209e1a7567d416678b8e
       url: "https://pub.dev"
     source: hosted
-    version: "1.11.0"
+    version: "1.10.0"
   ordered_set:
     dependency: transitive
     description:
@@ -215,14 +199,6 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.1.4"
-  vm_service:
-    dependency: transitive
-    description:
-      name: vm_service
-      sha256: b3d56ff4341b8f182b96aceb2fa20e3dcb336b9f867bc0eafc0de10f1048e957
-      url: "https://pub.dev"
-    source: hosted
-    version: "13.0.0"
   web:
     dependency: transitive
     description:
diff --git a/examples/execution_plan/pubspec.lock b/examples/execution_plan/pubspec.lock
index 62b7995..ee00a79 100644
--- a/examples/execution_plan/pubspec.lock
+++ b/examples/execution_plan/pubspec.lock
@@ -76,7 +76,7 @@ packages:
       path: "../.."
       relative: true
     source: path
-    version: "0.2.1"
+    version: "0.2.2"
   flutter_lints:
     dependency: "direct dev"
     description:
@@ -90,22 +90,6 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
-  leak_tracker:
-    dependency: transitive
-    description:
-      name: leak_tracker
-      sha256: "04be76c4a4bb50f14904e64749237e541e7c7bcf7ec0b196907322ab5d2fc739"
-      url: "https://pub.dev"
-    source: hosted
-    version: "9.0.16"
-  leak_tracker_testing:
-    dependency: transitive
-    description:
-      name: leak_tracker_testing
-      sha256: b06739349ec2477e943055aea30172c5c7000225f79dad4702e2ec0eda79a6ff
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.0.5"
   lints:
     dependency: transitive
     description:
@@ -126,18 +110,18 @@ packages:
     dependency: transitive
     description:
       name: material_color_utilities
-      sha256: "0e0a020085b65b6083975e499759762399b4475f766c21668c4ecca34ea74e5a"
+      sha256: "9528f2f296073ff54cb9fee677df673ace1218163c3bc7628093e7eed5203d41"
       url: "https://pub.dev"
     source: hosted
-    version: "0.8.0"
+    version: "0.5.0"
   meta:
     dependency: transitive
     description:
       name: meta
-      sha256: d584fa6707a52763a52446f02cc621b077888fb63b93bbcb1143a7be5a0c0c04
+      sha256: a6e590c838b18133bb482a2745ad77c5bb7715fb0451209e1a7567d416678b8e
       url: "https://pub.dev"
     source: hosted
-    version: "1.11.0"
+    version: "1.10.0"
   ordered_set:
     dependency: transitive
     description:
@@ -215,14 +199,6 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.1.4"
-  vm_service:
-    dependency: transitive
-    description:
-      name: vm_service
-      sha256: b3d56ff4341b8f182b96aceb2fa20e3dcb336b9f867bc0eafc0de10f1048e957
-      url: "https://pub.dev"
-    source: hosted
-    version: "13.0.0"
   web:
     dependency: transitive
     description:
diff --git a/lib/widgets/edge_component.dart b/lib/widgets/edge_component.dart
index 45905c7..1f6716e 100644
--- a/lib/widgets/edge_component.dart
+++ b/lib/widgets/edge_component.dart
@@ -37,6 +37,8 @@ class EdgeComponent extends ShapeComponent
   Duration get panelDelay =>
       gameRef.options.panelDelay ?? const Duration(milliseconds: 300);
 
+  bool get hasPanel => gameRef.options.edgePanelBuilder != null;
+
   @override
   FutureOr<void> onLoad() {
     hitBox = edgeShape.hitBox(edge, this);
@@ -47,10 +49,10 @@ class EdgeComponent extends ShapeComponent
 
   void loadOverlay() {
     var panelBuilder = gameRef.options.edgePanelBuilder;
-    if (panelBuilder == null) return;
+    if (!hasPanel) return;
 
     gameRef.overlays.addEntry(overlayName, (_, game) {
-      return panelBuilder(edge, gameRef.camera.viewfinder);
+      return panelBuilder!(edge, gameRef.camera.viewfinder);
     });
   }
 
@@ -75,7 +77,9 @@ class EdgeComponent extends ShapeComponent
   void onHoverEnter() {
     paint.strokeWidth = 4;
     gameRef.graph.hoverEdge = edge;
-    gameRef.overlays.add(overlayName);
+    if (hasPanel) {
+      gameRef.overlays.add(overlayName);
+    }
   }
 
   @override
@@ -91,8 +95,10 @@ class EdgeComponent extends ShapeComponent
   void onHoverExit() {
     paint.strokeWidth = 1;
     gameRef.graph.hoverEdge = null;
-    Future.delayed(panelDelay, () {
-      gameRef.overlays.remove(overlayName);
-    });
+    if (hasPanel) {
+      Future.delayed(panelDelay, () {
+        gameRef.overlays.remove(overlayName);
+      });
+    }
   }
 }
diff --git a/lib/widgets/vertex_component.dart b/lib/widgets/vertex_component.dart
index e1fd014..34aa703 100644
--- a/lib/widgets/vertex_component.dart
+++ b/lib/widgets/vertex_component.dart
@@ -52,6 +52,8 @@ class VertexComponent extends ShapeComponent
   Duration get panelDelay =>
       gameRef.options.panelDelay ?? const Duration(milliseconds: 300);
 
+  bool get hasPanel => gameRef.options.vertexPanelBuilder != null;
+
   @override
   FutureOr<void> onLoad() {
     if (options?.enableHit != false) {
@@ -64,10 +66,10 @@ class VertexComponent extends ShapeComponent
 
   void loadOverlay() {
     var panelBuilder = gameRef.options.vertexPanelBuilder;
-    if (panelBuilder == null) return;
+    if (!hasPanel) return;
 
     gameRef.overlays.addEntry(overlayName, (_, game) {
-      return panelBuilder(vertex, gameRef.camera.viewfinder);
+      return panelBuilder!(vertex, gameRef.camera.viewfinder);
     });
   }
 
@@ -116,15 +118,19 @@ class VertexComponent extends ShapeComponent
   @override
   void onHoverEnter() {
     graph.hoverVertex = vertex;
-    gameRef.overlays.add(overlayName);
+    if (hasPanel) {
+      gameRef.overlays.add(overlayName);
+    }
   }
 
   @override
   void onHoverExit() {
     graph.hoverVertex = null;
-    Future.delayed(panelDelay, () {
-      gameRef.overlays.remove(overlayName);
-    });
+    if (hasPanel) {
+      Future.delayed(panelDelay, () {
+        gameRef.overlays.remove(overlayName);
+      });
+    }
   }
 
   @override
diff --git a/pubspec.yaml b/pubspec.yaml
index 8b180f3..f4b5725 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,6 +1,6 @@
 name: flutter_graph_view
 description: Widgets for beautiful graphic data structures, such as force-oriented diagrams.
-version: 0.2.2
+version: 0.2.2+1
 homepage: https://github.com/dudu-ltd/flutter_graph_view
 
 environment: