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java.util.ConcurrentModificationException: null at java.util.LinkedHashMap$LinkedHashIterator.nextNode(Unknown Source)[?:1.8.0_151] at java.util.LinkedHashMap$LinkedKeyIterator.next(Unknown Source)[?:1.8.0_151] at java.util.Spliterators$IteratorSpliterator.tryAdvance(Unknown Source)[?:1.8.0_151] at java.util.stream.ReferencePipeline.forEachWithCancel(Unknown Source)[?:1.8.0_151] at java.util.stream.AbstractPipeline.copyIntoWithCancel(Unknown Source)[?:1.8.0_151] at java.util.stream.AbstractPipeline.copyInto(Unknown Source)[?:1.8.0_151] at java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source)[?:1.8.0_151] at java.util.stream.FindOps$FindOp.evaluateSequential(Unknown Source)[?:1.8.0_151] at java.util.stream.AbstractPipeline.evaluate(Unknown Source)[?:1.8.0_151] at java.util.stream.ReferencePipeline.findFirst(Unknown Source)[?:1.8.0_151] at nl.komtek.pt.bot.strategy.helper.StrategyRunnerHelper.getLastDCAMonitoringData(StrategyRunnerHelper.java:656)[classes!/:1.2.5.2] at nl.komtek.pt.bot.strategy.helper.StrategyRunnerHelper.DCAEnabled(StrategyRunnerHelper.java:69)[classes!/:1.2.5.2] at nl.komtek.pt.strategyrunner.GainStrategyRunner.checkSellStrategy(GainStrategyRunner.java:70)[classes!/:1.2.5.2] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)[?:1.8.0_151] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)[?:1.8.0_151] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)[?:1.8.0_151] at java.lang.reflect.Method.invoke(Unknown Source)[?:1.8.0_151] at org.springframework.scheduling.support.ScheduledMethodRunnable.run(ScheduledMethodRunnable.java:65)[spring-context-4.3.7.RELEASE.jar!/:4.3.7.RELEASE] at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54)[spring-context-4.3.7.RELEASE.jar!/:4.3.7.RELEASE] at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)[?:1.8.0_151] at java.util.concurrent.FutureTask.runAndReset(Unknown Source)[?:1.8.0_151] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(Unknown Source)[?:1.8.0_151] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source)[?:1.8.0_151] at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)[?:1.8.0_151] at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)[?:1.8.0_151] at java.lang.Thread.run(Unknown Source)[?:1.8.0_151]