HeapDiff error on Node 6.9.4

[djanowski]

/usr/local/Cellar/node@6/6.9.4/bin/node[68513]: ../src/async-wrap.cc:99:v8::RetainedObjectInfo *node::WrapperInfo(uint16_t, Local<v8::Value>): Assertion `(nullptr) != (wrap)' failed.
 1: node::Abort() [/usr/local/bin/node]
 2: node::RunMicrotasks(v8::FunctionCallbackInfo<v8::Value> const&) [/usr/local/bin/node]
 3: node::AsyncWrap* node::Unwrap<node::AsyncWrap>(v8::Local<v8::Object>) [/usr/local/bin/node]
 4: v8::internal::NativeObjectsExplorer::VisitSubtreeWrapper(v8::internal::Object**, unsigned short) [/usr/local/bin/node]
 5: v8::internal::GlobalHandles::IterateAllRootsWithClassIds(v8::internal::ObjectVisitor*) [/usr/local/bin/node]
 6: v8::internal::NativeObjectsExplorer::FillRetainedObjects() [/usr/local/bin/node]
 7: v8::internal::NativeObjectsExplorer::IterateAndExtractReferences(v8::internal::SnapshotFiller*) [/usr/local/bin/node]
 8: v8::internal::HeapSnapshotGenerator::FillReferences() [/usr/local/bin/node]
 9: v8::internal::HeapSnapshotGenerator::GenerateSnapshot() [/usr/local/bin/node]
10: v8::internal::HeapProfiler::TakeSnapshot(v8::ActivityControl*, v8::HeapProfiler::ObjectNameResolver*) [/usr/local/bin/node]
11: heapdiff::HeapDiff::New(Nan::FunctionCallbackInfo<v8::Value> const&) [/node_modules/memwatch-ng/build/Release/memwatch.node]
12: Nan::imp::FunctionCallbackWrapper(v8::FunctionCallbackInfo<v8::Value> const&) [/node_modules/memwatch-ng/build/Release/memwatch.node]
13: v8::internal::FunctionCallbackArguments::Call(void (*)(v8::FunctionCallbackInfo<v8::Value> const&)) [/usr/local/bin/node]
14: v8::internal::Builtin_Impl_HandleApiCallConstruct(v8::internal::(anonymous namespace)::BuiltinArguments<(v8::internal::BuiltinExtraArguments)1>, v8::internal::Isolate*) [/usr/local/bin/node]
15: v8::internal::Builtin_HandleApiCallConstruct(int, v8::internal::Object**, v8::internal::Isolate*) [/usr/local/bin/node]
16: 0x17da807092a7
17: 0x17da8073b6ba
18: 0x17da8162ed92
19: 0x17da80bd71ca
20: 0x17da813f5daa
21: 0x17da80709895
22: 0x17da813f5bf2
Abort trap: 6

[djanowski]

Unfortunately I haven't been able to create a standalone example of this error, even using async/await and Bluebird.