Error: Can not write to stream after nil
at Stream._generator_push (/Users/bert/code/histograph/core/node_modules/highland/lib/index.js:482:23)
at cb (/Users/bert/code/histograph/core/node_modules/highland/lib/index.js:3990:21)
at IncomingMessage.<anonymous> (/Users/bert/code/histograph/core/node_modules/graphmalizer-core/utils/neo4batch.js:76:4)
at IncomingMessage.emit (events.js:129:20)
at _stream_readable.js:908:16
at process._tickCallback (node.js:355:11)