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
#include "net/base/net_errors.h"
#include "third_party/WebKit/public/web/WebCustomElement.h"
#include "third_party/WebKit/public/web/WebDocument.h"
#include "third_party/WebKit/public/web/WebFrameWidget.h"
#include "third_party/WebKit/public/web/WebLocalFrame.h"
#include "third_party/WebKit/public/web/WebPluginParams.h"
#include "third_party/WebKit/public/web/WebKit.h"
#include "third_party/WebKit/public/web/WebScriptSource.h"
#include "third_party/WebKit/public/web/WebSecurityPolicy.h"
#include "third_party/WebKit/public/web/WebRuntimeFeatures.h"
#include "third_party/WebKit/public/web/WebView.h"
#if defined(OS_MACOSX)
#include "base/mac/mac_util.h"
#include "base/strings/sys_string_conversions.h"
#endif
#if defined(OS_WIN)
#include <shlobj.h>
#endif
namespace atom {
namespace {
class AtomRenderFrameObserver : public content::RenderFrameObserver {
 public:
  AtomRenderFrameObserver(content::RenderFrame* frame,
                          AtomRendererClient* renderer_client)
      : content::RenderFrameObserver(frame),
        render_frame_(frame),
        world_id_(-1),
        renderer_client_(renderer_client) {}
  
  void DidClearWindowObject() override {