Zzzls_y lost connection: Internal server error
[21:13:17 INFO]: Zzzls_y left the game
[21:13:17 WARN]: [AuthMe] Task #33 for AuthMe v5.4.0-b1877 generated an exception
java.lang.NullPointerException: null
at java.util.Objects.requireNonNull(Objects.java:203) ~[?:1.8.0_252]
at java.util.Arrays$ArrayList.<init>(Arrays.java:3813) ~[?:1.8.0_252]
at java.util.Arrays.asList(Arrays.java:3800) ~[?:1.8.0_252]
at fr.xephi.authme.permission.handlers.VaultHandler.getGroups(VaultHandler.java:79) ~[?:?]
at fr.xephi.authme.permission.handlers.VaultHandler.getGroups(VaultHandler.java:19) ~[?:?]
at fr.xephi.authme.permission.PermissionsManager.getGroups(PermissionsManager.java:295) ~[?:?]
at fr.xephi.authme.data.limbo.LimboServiceHelper.createLimboPlayer(LimboServiceHelper.java:47) ~[?:?]
at fr.xephi.authme.data.limbo.LimboService.createLimboPlayer(LimboService.java:70) ~[?:?]
at fr.xephi.authme.process.join.AsynchronousJoin.lambda$processJoinSync$6(AsynchronousJoin.java:160) ~[?:?]
at org.bukkit.craftbukkit.v1_12_R1.scheduler.CraftTask.run(CraftTask.java:77) ~[CraftTask.class:bb39330]
at org.bukkit.craftbukkit.v1_12_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:421) [CraftScheduler.class:bb39330]
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:833) [MinecraftServer.class:?]
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:468) [nz.class:?]
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:775) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:618) [MinecraftServer.class:?]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_252]
>

换用重制版最新版试试？
https://www.mcbbs.net/forum.php?mod=viewthread&tid=442729

是直接把原来那个登陆插件替换了吗