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java.util.ConcurrentModificationException: null	at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1380)	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:512)	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:502)	at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)	at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)	at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418)