JavaScript heap out of memory

[f-w]

Got following error and Nodejs process crashed after generating 50 or so voices, an indication of memory leak

Bad data: '/espeak/espeak-data/en_dict' (6c756e28 length=6c756e28)
FATAL ERROR: CALL_AND_RETRY_LAST Allocation failed - JavaScript heap out of memory
 1: node::Abort() [node]
 2: 0x102266c [node]
 3: v8::Utils::ReportOOMFailure(char const*, bool) [node]
 4: v8::internal::V8::FatalProcessOutOfMemory(char const*,
bool) [node]
 5: v8::internal::Factory::NewUninitializedFixedArray(int)
[node]
 6: 0xbec034 [node]
 7: 0xbec20f [node]
 8: v8::internal::JSObject::AddDataElement(v8::internal::Handle<v8::internal::JSObject>, unsigned int, v8::internal::Handle<v8::internal::Object>, v8::internal::PropertyAttributes, v8::internal::Object::ShouldThrow) [node]
 9: v8::internal::Object::SetProperty(v8::internal::LookupIterator*, v8::internal::Handle<v8::internal::Object>, v8::internal::LanguageMode, v8::internal::Object::StoreFromKeyed) [node]
10: v8::internal::Runtime::SetObjectProperty(v8::internal::Isolate*, v8::internal::Handle<v8::internal::Object>, v8::internal::Handle<v8::internal::Object>, v8::internal::Handle<v8::internal::Object>, v8::internal::LanguageMode) [node]
11: v8::internal::Runtime_SetProperty(int, v8::internal::Object**, v8::internal::Isolate*) [node]
12: 0xccf338463d