diff --git a/src/node_platform.cc b/src/node_platform.cc
index 380a26ecb4bab6..713051efc3fc7a 100644
--- a/src/node_platform.cc
+++ b/src/node_platform.cc
@@ -244,14 +244,22 @@ void PerIsolatePlatformData::PostIdleTask(std::unique_ptr<v8::IdleTask> task) {
 }
 
 void PerIsolatePlatformData::PostTask(std::unique_ptr<Task> task) {
-  CHECK_NOT_NULL(flush_tasks_);
+  if (flush_tasks_ == nullptr) {
+    // V8 may post tasks during Isolate disposal. In that case, the only
+    // sensible path forward is to discard the task.
+    return;
+  }
   foreground_tasks_.Push(std::move(task));
   uv_async_send(flush_tasks_);
 }
 
 void PerIsolatePlatformData::PostDelayedTask(
     std::unique_ptr<Task> task, double delay_in_seconds) {
-  CHECK_NOT_NULL(flush_tasks_);
+  if (flush_tasks_ == nullptr) {
+    // V8 may post tasks during Isolate disposal. In that case, the only
+    // sensible path forward is to discard the task.
+    return;
+  }
   std::unique_ptr<DelayedTask> delayed(new DelayedTask());
   delayed->task = std::move(task);
   delayed->platform_data = shared_from_this();