requiring C++ addon modules occurs 'Error: Module did not self-register.' with Worker Threads

Version: v10.5.0
Platform: Darwin nakajimashigeru-no-MacBook-Pro.local 16.7.0 Darwin Kernel Version 16.7.0: Fri Apr 27 17:59:46 PDT 2018; root:xnu-3789.73.13~1/RELEASE_X86_64 x86_64
Subsystem: worker

When C++ addon was loaded twice with worker threads, error below occurs:

events.js:167
      throw er; // Unhandled 'error' event
      ^
Error: Module did not self-register.
    at Object.Module._extensions..node (internal/modules/cjs/loader.js:731:18)
    at Module.load (internal/modules/cjs/loader.js:612:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:551:12)
    at Function.Module._load (internal/modules/cjs/loader.js:543:3)
    at Module.require (internal/modules/cjs/loader.js:650:17)
    at require (internal/modules/cjs/helpers.js:20:18)
    at bindings (/Users/shigerunakajima/worker_thread_test/node_modules/bindings/bindings.js:81:44)
    at Object.<anonymous> (/Users/shigerunakajima/worker_thread_test/node_modules/libxmljs/lib/bindings.js:1:99)
    at Module._compile (internal/modules/cjs/loader.js:702:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:713:10)
Emitted 'error' event at:
    at Worker.[kOnErrorMessage] (internal/worker.js:281:10)
    at Worker.[kOnMessage] (internal/worker.js:291:37)
    at MessagePort.Worker.(anonymous function).on (internal/worker.js:228:57)
    at MessagePort.emit (events.js:182:13)
    at MessagePort.onmessage (internal/worker.js:57:8)

To reproduce, run code below with --experimental-worker flag:

const libxmljs = require('libxmljs')
const {
  Worker
} = require('worker_threads')

new Worker(__filename)

When I try to require the sharp, same error occurs.