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java.util.ConcurrentModificationException: 	at java.util.HashMap$EntrySpliterator.tryAdvance(Unknown Source)	at java.util.stream.ReferencePipeline.forEachWithCancel(Unknown Source)	at java.util.stream.AbstractPipeline.copyIntoWithCancel(Unknown Source)	at java.util.stream.AbstractPipeline.copyInto(Unknown Source)	at java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source)	at java.util.stream.MatchOps$MatchOp.evaluateSequential(Unknown Source)	at java.util.stream.MatchOps$MatchOp.evaluateSequential(Unknown Source)	at java.util.stream.AbstractPipeline.evaluate(Unknown Source)	at java.util.stream.ReferencePipeline.anyMatch(Unknown Source)	at io.github.nucleuspowered.nucleus.config.loaders.UserConfigLoader.clearNullSoftReferences(UserConfigLoader.java:127)	at io.github.nucleuspowered.nucleus.config.loaders.UserConfigLoader.getUser(UserConfigLoader.java:70)	at io.github.nucleuspowered.nucleus.config.loaders.UserConfigLoader.getUser(UserConfigLoader.java:58)	at io.github.nucleuspowered.nucleus.internal.migrators.EssCmdsMigrator.migrate(EssCmdsMigrator.java:106)	at io.github.nucleuspowered.nucleus.internal.command.MigratorCommand.executeCommand(MigratorCommand.java:67)	at io.github.nucleuspowered.nucleus.internal.command.AbstractCommand.startExecute(AbstractCommand.java:378)	at io.github.nucleuspowered.nucleus.internal.command.AbstractCommand.lambda$execute$45(AbstractCommand.java:364)	at org.spongepowered.api.scheduler.Task$Builder.lambda$execute$0(Task.java:138)	at org.spongepowered.common.scheduler.SchedulerBase.lambda$startTask$0(SchedulerBase.java:177)	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)	at java.util.concurrent.FutureTask.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)