diff --git a/update_boot_flags_action.cc b/update_boot_flags_action.cc
index 97ef7f2..ee92ae0 100644
--- a/update_boot_flags_action.cc
+++ b/update_boot_flags_action.cc
@@ -50,8 +50,11 @@
   }
 }
 
-void UpdateBootFlagsAction::CompleteUpdateBootFlags(bool successful) {
+void UpdateBootFlagsAction::TerminateProcessing() {
   is_running_ = false;
+}
+
+void UpdateBootFlagsAction::CompleteUpdateBootFlags(bool successful) {
   if (!successful) {
     // We ignore the failure for now because if the updating boot flags is flaky
     // or has a bug in a specific release, then blocking the update can cause
@@ -61,6 +64,18 @@
     // TODO(ahassani): Add new error code metric for kUpdateBootFlagsFailed.
     LOG(ERROR) << "Updating boot flags failed, but ignoring its failure.";
   }
+
+  // As the callback to MarkBootSuccessfulAsync, this function can still be
+  // called even after the current UpdateBootFlagsAction object get destroyed by
+  // the action processor. In this case, check the value of the static variable
+  // |is_running_| and skip executing the callback function.
+  if (!is_running_) {
+    LOG(INFO) << "UpdateBootFlagsAction is no longer running.";
+    return;
+  }
+
+  is_running_ = false;
+
   updated_boot_flags_ = true;
   processor_->ActionComplete(this, ErrorCode::kSuccess);
 }
diff --git a/update_boot_flags_action.h b/update_boot_flags_action.h
index afa2c3f..892aab7 100644
--- a/update_boot_flags_action.h
+++ b/update_boot_flags_action.h
@@ -30,6 +30,8 @@
 
   void PerformAction() override;
 
+  void TerminateProcessing() override;
+
   static std::string StaticType() { return "UpdateBootFlagsAction"; }
   std::string Type() const override { return StaticType(); }