FATAL ERROR: v8::ToLocalChecked Empty MaybeLocal.

[zeg-io]

Just upgraded to Node 8. When my project attempts to run

app.use(require('node-sass-middleware')({
  src: path.join(__dirname, 'public'),
  dest: path.join(__dirname, 'public'),
  indentedSyntax: true,
  sourceMap: true
}))

it craps out with:

FATAL ERROR: v8::ToLocalChecked Empty MaybeLocal.
 1: node::Abort() [/usr/local/bin/node]
 2: node::FatalException(v8::Isolate*, v8::Local<v8::Value>, v8::Local<v8::Message>) [/usr/local/bin/node]
 3: v8::V8::ToLocalEmpty() [/usr/local/bin/node]
 4: node::inspector::(anonymous namespace)::CallAndPauseOnStart(v8::FunctionCallbackInfo<v8::Value> const&) [/usr/local/bin/node]
 5: v8::internal::FunctionCallbackArguments::Call(void (*)(v8::FunctionCallbackInfo<v8::Value> const&)) [/usr/local/bin/node]
 6: v8::internal::MaybeHandle<v8::internal::Object> v8::internal::(anonymous namespace)::HandleApiCallHelper<false>(v8::internal::Isolate*, v8::internal::Handle<v8::internal::HeapObject>, v8::internal::Handle<v8::internal::HeapObject>, v8::internal::Handle<v8::internal::FunctionTemplateInfo>, v8::internal::Handle<v8::internal::Object>, v8::internal::BuiltinArguments) [/usr/local/bin/node]
 7: v8::internal::Builtin_Impl_HandleApiCall(v8::internal::BuiltinArguments, v8::internal::Isolate*) [/usr/local/bin/node]
 8: 0x1cc6388437d
 9: 0x1cc63a50969
10: 0x1cc63a4a823

[am11]

Node.js 8 is supported is added to node-sass in v4.5.3. Do you have same version installed in node_modules? If not, just try running npm update to get latest node-sass.

[zeg-io]

Winner winner chicken dinner!

[glassdimlygr]

I got this error when using a custom node-sass importer when I had a syntax error in the importer. sass/node-sass#530