java.lang.AssertionError: Object to save cannot be null!

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java.lang.AssertionError: Object to save cannot be null!
at water.serial.KeyedBinarySerializer.save(KeyedBinarySerializer.java:35)
at water.serial.KeyedBinarySerializer.save(KeyedBinarySerializer.java:17)
at water.serial.ObjectTreeBinarySerializer.save(ObjectTreeBinarySerializer.java:72)
at water.api.ModelsHandler.exportModel(ModelsHandler.java:206)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at water.api.Handler.handle(Handler.java:56)
at water.api.RequestServer.handle(RequestServer.java:677)
at water.api.RequestServer.serve(RequestServer.java:614)
at water.NanoHTTPD$HTTPSession.run(NanoHTTPD.java:438)
at java.lang.Thread.run(Thread.java:745)

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