diff --git a/CHANGELOG.md b/CHANGELOG.md
index 537e033..e7fe3c6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+## [1.2.2] - 2019-06-22
+
+**Bug fixes**
+
+- fixed type definition for render object [#10](https://github.com/TatsuUkraine/flutter_sticky_infinite_list/issues/10)
+
 ## [1.2.1] - 2019-06-21
 
 - shorten package description
diff --git a/lib/render.dart b/lib/render.dart
index 8d27751..b7ab0f0 100644
--- a/lib/render.dart
+++ b/lib/render.dart
@@ -156,7 +156,7 @@ class StickyListItemRenderObject<I> extends RenderStack {
   }
 
   bool get _scrollDirectionVertical =>
-      [AxisDirection.up, AxisDirection.down].contains(_scrollable.axisDirection);
+      [AxisDirection.up, AxisDirection.down].contains(scrollable.axisDirection);
 
   bool get _alignmentStart {
     if (_scrollDirectionVertical) {
diff --git a/lib/widget.dart b/lib/widget.dart
index 3a77644..1e4c046 100644
--- a/lib/widget.dart
+++ b/lib/widget.dart
@@ -406,14 +406,15 @@ class StickyListItem<I> extends Stack {
 
   @override
   @mustCallSuper
-  void updateRenderObject(
-      BuildContext context, StickyListItemRenderObject<I> renderObject) {
+  void updateRenderObject(BuildContext context, RenderStack renderObject) {
     super.updateRenderObject(context, renderObject);
 
-    renderObject
-      ..scrollable = _getScrollableState(context)
-      ..itemIndex = itemIndex
-      ..streamSink = streamSink
-      ..minOffsetProvider = minOffsetProvider;
+    if (renderObject is StickyListItemRenderObject<I>) {
+      renderObject
+        ..scrollable = _getScrollableState(context)
+        ..itemIndex = itemIndex
+        ..streamSink = streamSink
+        ..minOffsetProvider = minOffsetProvider;
+    }
   }
 }
diff --git a/pubspec.yaml b/pubspec.yaml
index 2976549..e564cbd 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -5,7 +5,7 @@ description: >-
 
   Can be customized or with config options or with override.
 
-version: 1.2.1
+version: 1.2.2
 author: TatsuUkraine <tatsu.ukraine@gmail.com>
 homepage: https://github.com/TatsuUkraine/flutter_sticky_infinite_list
 repository: https://github.com/TatsuUkraine/flutter_sticky_infinite_list