Server crash by command /ec

[AbgezocktHD5336]

java.lang.reflect.InaccessibleObjectException: Unable to make field java.lang.ThreadLocal$ThreadLocalMap java.lang.Thread.threadLocals accessible: module java.base does not "opens java.lang" to unnamed module @2f4551e6
at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:354)
at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297)
at java.base/java.lang.reflect.Field.checkCanSetAccessible(Field.java:178)
at java.base/java.lang.reflect.Field.setAccessible(Field.java:172)
at cn.nukkit.utils.IterableThreadLocal.clean(IterableThreadLocal.java:55)
at cn.nukkit.utils.IterableThreadLocal.clean(IterableThreadLocal.java:38)
at cn.nukkit.level.Level.close(Level.java:517)
at cn.nukkit.level.Level.unload(Level.java:753)
at cn.nukkit.Server.unloadLevel(Server.java:2113)
at cn.nukkit.Server.forceShutdown(Server.java:1056)
at cn.nukkit.Server.start(Server.java:1107)
at cn.nukkit.Server.(Server.java:778)
at cn.nukkit.Nukkit.main(Nukkit.java:200)