FlatBuffers: object serialization must not be nested.

[Jaxkr]

[03:03:18 WARN]: Exception in thread "Thread-5" java.lang.AssertionError: FlatBuffers: object serialization must not be nested.
[03:03:18 INFO]: Done (6.876s)! For help, type "help"
[03:03:18 WARN]:        at WorldQLClient-1.0-SNAPSHOT.jar//com.google.flatbuffers.FlatBufferBuilder.notNested(FlatBufferBuilder.java:688)
[03:03:18 WARN]:        at WorldQLClient-1.0-SNAPSHOT.jar//com.google.flatbuffers.FlatBufferBuilder.startTable(FlatBufferBuilder.java:744)
[03:03:18 WARN]:        at WorldQLClient-1.0-SNAPSHOT.jar//com.worldql.client.Messages.Message.startMessage(Message.java:48)
[03:03:18 WARN]:        at WorldQLClient-1.0-SNAPSHOT.jar//com.worldql.client.serialization.Codec.encodeMessage(Codec.java:134)
[03:03:18 WARN]:        at WorldQLClient-1.0-SNAPSHOT.jar//com.worldql.client.serialization.Message.encode(Message.java:186)
[03:03:18 INFO]: Timings Reset
[03:03:18 WARN]:        at WorldQLClient-1.0-SNAPSHOT.jar//com.worldql.client.ZeroMQServer.run(ZeroMQServer.java:45)
[03:03:18 WARN]:        at java.base/java.lang.Thread.run(Thread.java:833)

Caused by

mammoth/src/main/java/com/worldql/client/ZeroMQServer.java

Line 45 in 105b663

WorldQLClient.getPluginInstance().getPushSocket().send(message.encode(), ZMQ.DONTWAIT);

Strangely this is intermittent and I can't figure out how to consistently reproduce it. Perhaps improper use of Flatbuffers in the serialization.Message class?