Sign.getFacing(Sing) return null

[wojtess]

full error:

java.lang.NullPointerException: null
	at org.bukkit.material.Sign.getFacing(Sign.java:134) ~[patched_1.16.4.jar:git-Paper-351]
	at me.crafter.mc.lockettepro.LocketteProAPI.getAttachedBlock(LocketteProAPI.java:458) ~[?:?]
	at me.crafter.mc.lockettepro.LocketteProAPI.isOwnerOfSign(LocketteProAPI.java:201) ~[?:?]
	at me.crafter.mc.lockettepro.BlockPlayerListener.playerSelectSign(BlockPlayerListener.java:174) ~[?:?]
	at com.destroystokyo.paper.event.executor.asm.generated.GeneratedEventExecutor2740.execute(Unknown Source) ~[?:?]
	at org.bukkit.plugin.EventExecutor.lambda$create$1(EventExecutor.java:69) ~[patched_1.16.4.jar:git-Paper-351]
	at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:80) ~[patched_1.16.4.jar:git-Paper-351]
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70) ~[patched_1.16.4.jar:git-Paper-351]
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:607) ~[patched_1.16.4.jar:git-Paper-351]
	at org.bukkit.craftbukkit.v1_16_R3.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:507) ~[patched_1.16.4.jar:git-Paper-351]
	at net.minecraft.server.v1_16_R3.PlayerInteractManager.a(PlayerInteractManager.java:464) ~[patched_1.16.4.jar:git-Paper-351]
	at net.minecraft.server.v1_16_R3.PlayerConnection.a(PlayerConnection.java:1549) ~[patched_1.16.4.jar:git-Paper-351]
	at net.minecraft.server.v1_16_R3.PacketPlayInUseItem.a(PacketPlayInUseItem.java:27) ~[patched_1.16.4.jar:git-Paper-351]
	at net.minecraft.server.v1_16_R3.PacketPlayInUseItem.a(PacketPlayInUseItem.java:5) ~[patched_1.16.4.jar:git-Paper-351]
	at net.minecraft.server.v1_16_R3.PlayerConnectionUtils.lambda$ensureMainThread$1(PlayerConnectionUtils.java:23) ~[patched_1.16.4.jar:git-Paper-351]
	at net.minecraft.server.v1_16_R3.TickTask.run(SourceFile:18) ~[patched_1.16.4.jar:git-Paper-351]
	at net.minecraft.server.v1_16_R3.IAsyncTaskHandler.executeTask(IAsyncTaskHandler.java:136) ~[patched_1.16.4.jar:git-Paper-351]
	at net.minecraft.server.v1_16_R3.IAsyncTaskHandlerReentrant.executeTask(SourceFile:23) ~[patched_1.16.4.jar:git-Paper-351]
	at net.minecraft.server.v1_16_R3.IAsyncTaskHandler.executeNext(IAsyncTaskHandler.java:109) ~[patched_1.16.4.jar:git-Paper-351]
	at net.minecraft.server.v1_16_R3.MinecraftServer.bb(MinecraftServer.java:1133) ~[patched_1.16.4.jar:git-Paper-351]
	at net.minecraft.server.v1_16_R3.MinecraftServer.executeNext(MinecraftServer.java:1126) ~[patched_1.16.4.jar:git-Paper-351]
	at net.minecraft.server.v1_16_R3.IAsyncTaskHandler.awaitTasks(IAsyncTaskHandler.java:119) ~[patched_1.16.4.jar:git-Paper-351]
	at net.minecraft.server.v1_16_R3.MinecraftServer.a(MinecraftServer.java:1200) ~[patched_1.16.4.jar:git-Paper-351]
	at net.minecraft.server.v1_16_R3.MinecraftServer.w(MinecraftServer.java:997) ~[patched_1.16.4.jar:git-Paper-351]
	at net.minecraft.server.v1_16_R3.MinecraftServer.lambda$a$0(MinecraftServer.java:178) ~[patched_1.16.4.jar:git-Paper-351]
	at java.lang.Thread.run(Thread.java:834) [?:?]```
	
	cant block any chests, error is showing when i placing sing