Threadpool Error

2018-03-25 22:43:47.640 [Dispatch Handler] ERROR sx.blah.discord.Discord4J - Unable to process JSON!
java.util.concurrent.RejectedExecutionException: Task sx.blah.discord.api.events.EventDispatcher$$Lambda$63/1227985784@5aa0144d rejected from java.util.concurrent.ThreadPoolExecutor@30854cd3[Running, pool size = 50, active threads = 50, queued tasks = 1000, completed tasks = 233618]
    at java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:2063)
    at java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:830)
    at java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1379)
    at sx.blah.discord.api.events.EventDispatcher.lambda$dispatch$18(EventDispatcher.java:607)
    at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
    at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175)
    at java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1553)
    at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
    at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
    at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
    at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
    at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
    at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418)
    at sx.blah.discord.api.events.EventDispatcher.dispatch(EventDispatcher.java:606)
    at sx.blah.discord.api.internal.DispatchHandler.messageCreate(DispatchHandler.java:316)
    at sx.blah.discord.api.internal.DispatchHandler.lambda$handle$0(DispatchHandler.java:124)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)