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

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java.util.ConcurrentModificationException:
at io.github.nucleuspowered.nucleus.config.loaders.AbstractDataLoader.saveAll(AbstractDataLoader.java:30)
at io.github.nucleuspowered.nucleus.Nucleus.saveData(Nucleus.java:200)
at io.github.nucleuspowered.nucleus.modules.core.runnables.CoreTask.accept(CoreTask.java:35)
at io.github.nucleuspowered.nucleus.modules.core.runnables.CoreTask.accept(CoreTask.java:17)
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)

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