OnlineShop System mit Accounts | MySQL, UUID + Erklärungsvideo 1.0

org.bukkit.command.CommandException: Unhandled exception executing command 'redeem' in plugin OnlineShopSpigot v1.0
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:47) ~[spigot-1.16.4.jar:git-Spigot-628435a-6917945]
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:149) ~[spigot-1.16.4.jar:git-Spigot-628435a-6917945]
at org.bukkit.craftbukkit.v1_16_R3.CraftServer.dispatchCommand(CraftServer.java:763) ~[spigot-1.16.4.jar:git-Spigot-628435a-6917945]
at net.minecraft.server.v1_16_R3.PlayerConnection.handleCommand(PlayerConnection.java:1788) ~[spigot-1.16.4.jar:git-Spigot-628435a-6917945]
at net.minecraft.server.v1_16_R3.PlayerConnection.c(PlayerConnection.java:1631) ~[spigot-1.16.4.jar:git-Spigot-628435a-6917945]
at net.minecraft.server.v1_16_R3.PlayerConnection.a(PlayerConnection.java:1584) ~[spigot-1.16.4.jar:git-Spigot-628435a-6917945]
at net.minecraft.server.v1_16_R3.PacketPlayInChat.a(PacketPlayInChat.java:47) ~[spigot-1.16.4.jar:git-Spigot-628435a-6917945]
at net.minecraft.server.v1_16_R3.PacketPlayInChat.a(PacketPlayInChat.java:1) ~[spigot-1.16.4.jar:git-Spigot-628435a-6917945]
at net.minecraft.server.v1_16_R3.PlayerConnectionUtils.lambda$0(PlayerConnectionUtils.java:19) ~[spigot-1.16.4.jar:git-Spigot-628435a-6917945]
at net.minecraft.server.v1_16_R3.TickTask.run(SourceFile:18) ~[spigot-1.16.4.jar:git-Spigot-628435a-6917945]
at net.minecraft.server.v1_16_R3.IAsyncTaskHandler.executeTask(SourceFile:144) ~[spigot-1.16.4.jar:git-Spigot-628435a-6917945]
at net.minecraft.server.v1_16_R3.IAsyncTaskHandlerReentrant.executeTask(SourceFile:23) ~[spigot-1.16.4.jar:git-Spigot-628435a-6917945]
at net.minecraft.server.v1_16_R3.IAsyncTaskHandler.executeNext(SourceFile:118) ~[spigot-1.16.4.jar:git-Spigot-628435a-6917945]
at net.minecraft.server.v1_16_R3.MinecraftServer.bb(MinecraftServer.java:942) ~[spigot-1.16.4.jar:git-Spigot-628435a-6917945]
at net.minecraft.server.v1_16_R3.MinecraftServer.executeNext(MinecraftServer.java:935) ~[spigot-1.16.4.jar:git-Spigot-628435a-6917945]
at net.minecraft.server.v1_16_R3.IAsyncTaskHandler.executeAll(SourceFile:103) ~[spigot-1.16.4.jar:git-Spigot-628435a-6917945]
at net.minecraft.server.v1_16_R3.MinecraftServer.sleepForTick(MinecraftServer.java:918) ~[spigot-1.16.4.jar:git-Spigot-628435a-6917945]
at net.minecraft.server.v1_16_R3.MinecraftServer.w(MinecraftServer.java:851) ~[spigot-1.16.4.jar:git-Spigot-628435a-6917945]
at net.minecraft.server.v1_16_R3.MinecraftServer.lambda$0(MinecraftServer.java:164) ~[spigot-1.16.4.jar:git-Spigot-628435a-6917945]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_171]
Caused by: java.lang.NullPointerException
at me.einpu.OnlineShop.commands.RedeemCommand.uuidExists(RedeemCommand.java:79) ~[?:?]
at me.einpu.OnlineShop.commands.RedeemCommand.onCommand(RedeemCommand.java:44) ~[?:?]
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:45) ~[spigot-1.16.4.jar:git-Spigot-628435a-6917945]
... 19 more