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java.util.ConcurrentModificationException: null	at java.util.LinkedHashMap$LinkedHashIterator.nextNode(Unknown Source)	at java.util.LinkedHashMap$LinkedKeyIterator.next(Unknown Source)	at java.util.Spliterators$IteratorSpliterator.tryAdvance(Unknown Source)	at java.util.stream.ReferencePipeline.forEachWithCancel(Unknown Source)	at java.util.stream.AbstractPipeline.copyIntoWithCancel(Unknown Source)	at java.util.stream.AbstractPipeline.copyInto(Unknown Source)	at java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source)	at java.util.stream.FindOps$FindOp.evaluateSequential(Unknown Source)	at java.util.stream.AbstractPipeline.evaluate(Unknown Source)	at java.util.stream.ReferencePipeline.findFirst(Unknown Source)	at nl.komtek.pt.bot.strategy.helper.StrategyRunnerHelper.getLastDCAMonitoringData(StrategyRunnerHelper.java:656)	at nl.komtek.pt.bot.strategy.helper.StrategyRunnerHelper.DCAEnabled(StrategyRunnerHelper.java:69)	at nl.komtek.pt.strategyrunner.GainStrategyRunner.checkSellStrategy(GainStrategyRunner.java:70)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at org.springframework.scheduling.support.ScheduledMethodRunnable.run(ScheduledMethodRunnable.java:65)	at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54)	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)	at java.util.concurrent.FutureTask.runAndReset(Unknown Source)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(Unknown Source)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)	at java.lang.Thread.run(Unknown Source)