Since about a month, all my builds fail with:
gulp[4953]: ../src/node_contextify.cc:628:static void node::contextify::ContextifyScript::New(const v8::FunctionCallbackInfo<v8::Value>&): Assertion `args[1]->IsString()' failed.
1: 0x8daaa0 node::Abort() [gulp]
2: 0x8dab75 [gulp]
3: 0x90e2f7 node::contextify::ContextifyScript::New(v8::FunctionCallbackInfo<v8::Value> const&) [gulp]
4: 0xb5e71b [gulp]
5: 0xb606b2 v8::internal::Builtin_HandleApiCall(int, v8::internal::Object**, v8::internal::Isolate*) [gulp]
6: 0xf8f4e35be1d
/home/travis/.travis/job_stages: line 104: 4953 Aborted (core dumped) gulp
The command "gulp" exited with 134.
Do you have an idea how I can fix that?