diff --git a/packages/myreact-reconciler/src/dispatchContext/feature.ts b/packages/myreact-reconciler/src/dispatchContext/feature.ts
index 42f128bc..aaab7975 100644
--- a/packages/myreact-reconciler/src/dispatchContext/feature.ts
+++ b/packages/myreact-reconciler/src/dispatchContext/feature.ts
@@ -69,7 +69,7 @@ export const defaultGetContextFiber_New = (
   renderDispatch: CustomRenderDispatch,
   ContextObject?: ReturnType<typeof createContext> | null
 ) => {
-  if (fiber.parent && ContextObject) {
+  if (fiber?.parent && ContextObject) {
     let parent = fiber.parent;
     while (parent) {
       if (include(parent.type, NODE_TYPE.__provider__)) {
diff --git a/packages/myreact-reconciler/src/runtimeComponent/feature.ts b/packages/myreact-reconciler/src/runtimeComponent/feature.ts
index c28cd38c..59ea3419 100644
--- a/packages/myreact-reconciler/src/runtimeComponent/feature.ts
+++ b/packages/myreact-reconciler/src/runtimeComponent/feature.ts
@@ -161,7 +161,7 @@ const processComponentContextOnUpdate = (fiber: MyReactFiberNode) => {
   const typedInstance = fiber.instance as MyReactComponent;
 
   if (typedComponent.contextType) {
-    if (!typedInstance?._contextFiber || include(typedInstance._contextFiber.state, STATE_TYPE.__unmount__)) {
+    if (!typedInstance._contextFiber || include(typedInstance._contextFiber.state, STATE_TYPE.__unmount__)) {
       const ProviderFiber = renderDispatch.resolveContextFiber(fiber, typedComponent.contextType);
 
       const context = renderDispatch.resolveContextValue(ProviderFiber, typedComponent.contextType);