java.util.ConcurrentModificationException: This exception has no message.

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This exception has no message.
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This exception has no message.
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This exception has no message.
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This exception has no message.
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java.util.ConcurrentModificationException:
at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1380)
at java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:580)
at com.web3.buyer.roomba.RoombaTurn.lambda$received$3(RoombaTurn.java:296)
at java.util.Iterator.forEachRemaining(Iterator.java:116)
at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
at java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:580)
at com.web3.buyer.roomba.RoombaTurn.received(RoombaTurn.java:295)
at com.web3.buyer.SystemBus.lambda$publishToTheQueue$0(SystemBus.java:51)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

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