I'm getting a segfault in the renderer process on both win64 and lnx64.  I've not yet isolated a minimal test case but the interrupt always occurs at _NewFromUtf8_.

> Program received signal SIGSEGV, Segmentation fault.
> 0x00007f0f7cacba08 in v8::String::NewFromUtf8(v8::Isolate_, char const_, v8::String::NewStringType, int) ()

This is on the latest release 1.2.2.

atom/renderer/atom_renderer_client.cc
renderer_client_->DidClearWindowObject(render_frame_);
  }
  void DidCreateScriptContext(v8::Handle<v8::Context> context,
                              int extension_group,
                              int world_id) override {
    if (world_id_ != -1 && world_id_ != world_id)
      return;
    world_id_ = world_id;
    renderer_client_->DidCreateScriptContext(context, render_frame_);
  }
  void WillReleaseScriptContext(v8::Local<v8::Context> context,
                                int world_id) override {
    if (world_id_ != world_id)
      return;
    renderer_client_->WillReleaseScriptContext(context, render_frame_);
  }
 private:
  content::RenderFrame* render_frame_;
  int world_id_;
  AtomRendererClient* renderer_client_;
  DISALLOW_COPY_AND_ASSIGN(AtomRenderFrameObserver);
};
v8::Local<v8::Value> GetRenderProcessPreferences(
    const PreferencesManager* preferences_manager, v8::Isolate* isolate) {
  if (preferences_manager->preferences())
    return mate::ConvertToV8(isolate, *preferences_manager->preferences());
  else
    return v8::Null(isolate);
}
void AddRenderBindings(v8::Isolate* isolate,