If you open the tomb and press "Take All Items" this error message appears in the console and the player is kicked from the server. After reconnecting, the grave is gone and the items are in the player's inventory

[00:49:15] [Server thread/WARN]: Failed to handle packet for /94.31.101.16:56653 net.minecraft.class_148: Ticking player at net.minecraft.class_3222.method_14226(class_3222.java:650) ~[server-intermediary.jar:?] at net.minecraft.class_3244.method_18784(class_3244.java:267) ~[server-intermediary.jar:?] at net.minecraft.class_2535.method_10754(class_2535.java:393) ~[server-intermediary.jar:?] at net.minecraft.class_3242.method_14357(class_3242.java:176) ~[server-intermediary.jar:?] at net.minecraft.server.MinecraftServer.method_3813(MinecraftServer.java:1009) ~[server-intermediary.jar:?] at net.minecraft.class_3176.method_3813(class_3176.java:294) ~[server-intermediary.jar:?] at net.minecraft.server.MinecraftServer.method_3748(MinecraftServer.java:889) ~[server-intermediary.jar:?] at net.minecraft.server.MinecraftServer.method_29741(MinecraftServer.java:691) ~[server-intermediary.jar:?] at net.minecraft.server.MinecraftServer.method_29739(MinecraftServer.java:275) ~[server-intermediary.jar:?] at java.base/java.lang.Thread.run(Thread.java:1583) [?:?] Caused by: java.lang.NullPointerException: Cannot invoke "eu.pb4.graves.registry.GraveCompassComponent.convertToVanilla()" because the return value of "net.minecraft.class_1799.method_57824(net.minecraft.class_9331)" is null at eu.pb4.graves.registry.GraveCompassItem.method_7888(GraveCompassItem.java:64) ~[SERVER-ONLY-graves-3.3.0+1.20.5.jar:?] at net.minecraft.class_1799.method_7917(class_1799.java:642) ~[server-intermediary.jar:?] at net.minecraft.class_1661.method_7381(class_1661.java:242) ~[server-intermediary.jar:?] at net.minecraft.class_1657.method_6007(class_1657.java:590) ~[server-intermediary.jar:?] at net.minecraft.class_1309.method_5773(class_1309.java:2529) ~[server-intermediary.jar:?] at net.minecraft.class_1657.method_5773(class_1657.java:306) ~[server-intermediary.jar:?] at net.minecraft.class_3222.method_14226(class_3222.java:586) ~[server-intermediary.jar:?] ... 9 more [00:49:15] [Server thread/INFO]: SirTiegertosch lost connection: Internal server error