Each time a certain player joing the server just ends up crashing and always says Internal Exception: Java.lag.StackOverFlowError

Feature placement
26.05 12:00:21 [Server] INFO at net.minecraft.server.MinecraftServer.b(SourceFile:897) ~[snapshot_20w21a.jar:?]
26.05 12:00:21 [Server] INFO at xw.b(SourceFile:320) ~[snapshot_20w21a.jar:?]
26.05 12:00:21 [Server] INFO at net.minecraft.server.MinecraftServer.a(SourceFile:832) ~[snapshot_20w21a.jar:?]
26.05 12:00:21 [Server] INFO at net.minecraft.server.MinecraftServer.run(SourceFile:691) [snapshot_20w21a.jar:?]
26.05 12:00:21 [Server] INFO at java.lang.Thread.run(Thread.java:748) [?:1.8.0_252]
26.05 12:00:21 [Server] INFO Caused by: java.lang.UnsupportedOperationException
26.05 12:00:21 [Server] INFO at com.google.common.collect.ImmutableList.sort(ImmutableList.java:565) ~[snapshot_20w21a.jar:?]
26.05 12:00:21 [Server] INFO at asi.a(SourceFile:43) ~[snapshot_20w21a.jar:?]
26.05 12:00:21 [Server] INFO at asi.b(SourceFile:60) ~[snapshot_20w21a.jar:?]
26.05 12:00:21 [Server] INFO at cot.a(SourceFile:42) ~[snapshot_20w21a.jar:?]
26.05 12:00:21 [Server] INFO at cks.a(SourceFile:22) ~[snapshot_20w21a.jar:?]
26.05 12:00:21 [Server] INFO at cks.a(SourceFile:15) ~[snapshot_20w21a.jar:?]
26.05 12:00:21 [Server] INFO at cja.a(SourceFile:44) ~[snapshot_20w21a.jar:?]
26.05 12:00:21 [Server] INFO at cow.a(SourceFile:82) ~[snapshot_20w21a.jar:?]
26.05 12:00:21 [Server] INFO at csr.a(SourceFile:83) ~[snapshot_20w21a.jar:?]
26.05 12:00:21 [Server] INFO at csr.a(SourceFile:79) ~[snapshot_20w21a.jar:?]
26.05 12:00:21 [Server] INFO at csy.a(SourceFile:75) ~[snapshot_20w21a.jar:?]
26.05 12:00:21 [Server] INFO at bqd.a(SourceFile:560) ~[snapshot_20w21a.jar:?]
26.05 12:00:21 [Server] INFO at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) ~[?:1.8.0_252]
26.05 12:00:21 [Server] INFO at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175) ~[?:1.8.0_252]
26.05 12:00:21 [Server] INFO at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193) ~[?:1.8.0_252]
26.05 12:00:21 [Server] INFO at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193) ~[?:1.8.0_252]
26.05 12:00:21 [Server] INFO at java.util.PrimitiveIterator$OfLong.forEachRemaining(PrimitiveIterator.java:189) ~[?:1.8.0_252]
26.05 12:00:21 [Server] INFO at it.unimi.dsi.fastutil.longs.LongIterator.forEachRemaining(LongIterator.java:53) ~[snapshot_20w21a.jar:?]
26.05 12:00:21 [Server] INFO at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801) ~[?:1.8.0_252]
26.05 12:00:21 [Server] INFO at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482) ~[?:1.8.0_252]
26.05 12:00:21 [Server] INFO at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472) ~[?:1.8.0_252]
26.05 12:00:21 [Server] INFO at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) ~[?:1.8.0_252]