Error: java.lang.NullPointerException at org.sbolstandard.core2.GenBank.writeReferences(GenBank.java:514) at org.sbolstandard.core2.GenBank.writeComponentDefinition(GenBank.java:106) at org.sbolstandard.core2.GenBank.write(GenBank.java:124) at org.sbolstandard.core2.GenBank.write(GenBank.java:138) at org.sbolstandard.core2.SBOLWriter.write(SBOLWriter.java:231) at org.sbolstandard.core2.SBOLValidate.validate(SBOLValidate.java:2821) at org.sbolstandard.core2.SBOLValidate.validate(SBOLValidate.java:2702) at org.synbiohub.ConvertToGenBankJob.execute(ConvertToGenBankJob.java:27) at org.synbiohub.Main$1.run(Main.java:30) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) at responseCallbacks.(anonymous function) (/synbiohub/lib/java.js:69:16) at DestroyableTransform.javaProcess.stdout.pipe.on (/synbiohub/lib/java.js:40:3) at DestroyableTransform.emit (events.js:182:13) at addChunk (/synbiohub/node_modules/through2/node_modules/readable-stream/lib/_stream_readable.js:291:12) at readableAddChunk (/synbiohub/node_modules/through2/node_modules/readable-stream/lib/_stream_readable.js:278:11) at DestroyableTransform.Readable.push (/synbiohub/node_modules/through2/node_modules/readable-stream/lib/_stream_readable.js:245:10) at DestroyableTransform.Transform.push (/synbiohub/node_modules/through2/node_modules/readable-stream/lib/_stream_transform.js:148:32) at DestroyableTransform.write [as _transform] (/synbiohub/node_modules/binary-split/index.js:27:14) at DestroyableTransform.Transform._read (/synbiohub/node_modules/through2/node_modules/readable-stream/lib/_stream_transform.js:184:10) at DestroyableTransform.Transform._write (/synbiohub/node_modules/through2/node_modules/readable-stream/lib/_stream_transform.js:172:83) at doWrite (/synbiohub/node_modules/through2/node_modules/readable-stream/lib/_stream_writable.js:428:64) at writeOrBuffer (/synbiohub/node_modules/through2/node_modules/readable-stream/lib/_stream_writable.js:417:5) at DestroyableTransform.Writable.write (/synbiohub/node_modules/through2/node_modules/readable-stream/lib/_stream_writable.js:334:11) at Socket.ondata (_stream_readable.js:666:20) at Socket.emit (events.js:182:13) at addChunk (_stream_readable.js:283:12)