safety

lib/view_widget/classic_header.dart

@@ -56,11 +56,13 @@ class _CustomHeader extends RefreshIndicatorState<CustomHeader> {
   void initState() {
     super.initState();
 
-    rootBundle.load("assets/riv/finger_tapping.riv").then((value) async {
+    // rootBundle.load("assets/riv/finger_tapping.riv").then((value) async {
+    rootBundle.load("assets/riv/runner_boy.riv").then((value) async {
       final riveFile = RiveFile();
       riveFile.import(value);
       final artboard = riveFile.mainArtboard;
-      artboard.addController(_controllerIdle = SimpleAnimation("Idle_1"));
+      artboard.addController(_controllerIdle = SimpleAnimation("Animation"));
+      // artboard.addController(_controllerIdle = SimpleAnimation("Idle_1"));
 
       setState(() {
         _riveArtboard = artboard;
@@ -71,10 +73,12 @@ class _CustomHeader extends RefreshIndicatorState<CustomHeader> {
   @override
   Widget buildContent(BuildContext context, RefreshStatus mode) {
 
-    if (mode == RefreshStatus.idle) {
-      _controllerIdle.isActive = false;
-    } else {
-      _controllerIdle.isActive = true;
+    if (_controllerIdle != null) {
+      if (mode == RefreshStatus.idle) {
+        _controllerIdle.isActive = false;
+      } else {
+        _controllerIdle.isActive = true;
+      }
     }
 
     return Container(