Repair

Witam. Postanowiłem napisać komendę repair, lecz z jakiegoś powodu kiedy próbuje naprawić całą zawartość ekwipunku dostaje błąd. Wersja 1.15.2

[12:51:27] [Server thread/ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'ii' in plugin tets v1.0
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:47) ~[spigot-1.15.2.jar:git-Spigot-800b93f-8160e29]
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:149) ~[spigot-1.15.2.jar:git-Spigot-800b93f-8160e29]
	at org.bukkit.craftbukkit.v1_15_R1.CraftServer.dispatchCommand(CraftServer.java:711) ~[spigot-1.15.2.jar:git-Spigot-800b93f-8160e29]
	at net.minecraft.server.v1_15_R1.PlayerConnection.handleCommand(PlayerConnection.java:1657) ~[spigot-1.15.2.jar:git-Spigot-800b93f-8160e29]
	at net.minecraft.server.v1_15_R1.PlayerConnection.a(PlayerConnection.java:1497) ~[spigot-1.15.2.jar:git-Spigot-800b93f-8160e29]
	at net.minecraft.server.v1_15_R1.PacketPlayInChat.a(PacketPlayInChat.java:47) ~[spigot-1.15.2.jar:git-Spigot-800b93f-8160e29]
	at net.minecraft.server.v1_15_R1.PacketPlayInChat.a(PacketPlayInChat.java:1) ~[spigot-1.15.2.jar:git-Spigot-800b93f-8160e29]
	at net.minecraft.server.v1_15_R1.PlayerConnectionUtils.lambda$0(PlayerConnectionUtils.java:19) ~[spigot-1.15.2.jar:git-Spigot-800b93f-8160e29]
	at net.minecraft.server.v1_15_R1.TickTask.run(SourceFile:18) [spigot-1.15.2.jar:git-Spigot-800b93f-8160e29]
	at net.minecraft.server.v1_15_R1.IAsyncTaskHandler.executeTask(SourceFile:144) [spigot-1.15.2.jar:git-Spigot-800b93f-8160e29]
	at net.minecraft.server.v1_15_R1.IAsyncTaskHandlerReentrant.executeTask(SourceFile:23) [spigot-1.15.2.jar:git-Spigot-800b93f-8160e29]
	at net.minecraft.server.v1_15_R1.IAsyncTaskHandler.executeNext(SourceFile:118) [spigot-1.15.2.jar:git-Spigot-800b93f-8160e29]
	at net.minecraft.server.v1_15_R1.MinecraftServer.ba(MinecraftServer.java:918) [spigot-1.15.2.jar:git-Spigot-800b93f-8160e29]
	at net.minecraft.server.v1_15_R1.MinecraftServer.executeNext(MinecraftServer.java:911) [spigot-1.15.2.jar:git-Spigot-800b93f-8160e29]
	at net.minecraft.server.v1_15_R1.IAsyncTaskHandler.awaitTasks(SourceFile:127) [spigot-1.15.2.jar:git-Spigot-800b93f-8160e29]
	at net.minecraft.server.v1_15_R1.MinecraftServer.sleepForTick(MinecraftServer.java:895) [spigot-1.15.2.jar:git-Spigot-800b93f-8160e29]
	at net.minecraft.server.v1_15_R1.MinecraftServer.run(MinecraftServer.java:828) [spigot-1.15.2.jar:git-Spigot-800b93f-8160e29]
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_292]
Caused by: java.lang.NullPointerException
	at me.cpk.test.Main.repairAll(Main.java:56) ~[?:?]
	at me.cpk.test.Main.onCommand(Main.java:33) ~[?:?]
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:45) ~[spigot-1.15.2.jar:git-Spigot-800b93f-8160e29]
	... 17 more

	public void repairAll(Player player) {
		for (ItemStack item : player.getInventory().getContents()) {
			if(item.getType().isBlock()) return;
			if(item.getType().isEdible()) return;
			if(item.getType().isAir()) return;
			ItemMeta i = item.getItemMeta();
			if(i instanceof Damageable) {
				Damageable dmg = (Damageable) i;
				if(!dmg.hasDamage()) return;
				dmg.setDamage(0);
				item.setItemMeta(i);
				player.sendMessage("Naprawiono");
			}						
		}
	}