Помогите Vault API/Не могу вывести баланс игрока.

float balance = (float) main.getInstance().eco.money.getBalance(p);
p.sendMessage("" + balance);

Но после того как я вывожу баланс игрока в чат, в консоль выводится ошибка:

Could not pass event PlayerJoinEvent to StarNetwork.Prison v1.0
org.bukkit.event.EventException: null
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:319) ~[spigot-1.16.5.jar:2991-Spigot-018b9a0-f3f3094]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70) ~[spigot-1.16.5.jar:2991-Spigot-018b9a0-f3f3094]
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:589) ~[spigot-1.16.5.jar:2991-Spigot-018b9a0-f3f3094]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:576) ~[spigot-1.16.5.jar:2991-Spigot-018b9a0-f3f3094]
at net.minecraft.server.v1_16_R3.PlayerList.a(PlayerList.java:200) ~[spigot-1.16.5.jar:2991-Spigot-018b9a0-f3f3094]
at net.minecraft.server.v1_16_R3.LoginListener.c(LoginListener.java:154) ~[spigot-1.16.5.jar:2991-Spigot-018b9a0-f3f3094]
at net.minecraft.server.v1_16_R3.LoginListener.tick(LoginListener.java:53) ~[spigot-1.16.5.jar:2991-Spigot-018b9a0-f3f3094]
at net.minecraft.server.v1_16_R3.NetworkManager.a(NetworkManager.java:219) ~[spigot-1.16.5.jar:2991-Spigot-018b9a0-f3f3094]
at net.minecraft.server.v1_16_R3.ServerConnection.c(ServerConnection.java:130) ~[spigot-1.16.5.jar:2991-Spigot-018b9a0-f3f3094]
at net.minecraft.server.v1_16_R3.MinecraftServer.b(MinecraftServer.java:1127) ~[spigot-1.16.5.jar:2991-Spigot-018b9a0-f3f3094]
at net.minecraft.server.v1_16_R3.DedicatedServer.b(DedicatedServer.java:355) ~[spigot-1.16.5.jar:2991-Spigot-018b9a0-f3f3094]
at net.minecraft.server.v1_16_R3.MinecraftServer.a(MinecraftServer.java:1008) ~[spigot-1.16.5.jar:2991-Spigot-018b9a0-f3f3094]
at net.minecraft.server.v1_16_R3.MinecraftServer.w(MinecraftServer.java:847) ~[spigot-1.16.5.jar:2991-Spigot-018b9a0-f3f3094]
at net.minecraft.server.v1_16_R3.MinecraftServer.lambda$0(MinecraftServer.java:164) ~[spigot-1.16.5.jar:2991-Spigot-018b9a0-f3f3094]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_282]
Caused by: java.lang.NullPointerException
at Prison.main.fixofhandler.onPlayerJoin(fixofhandler.java:43) ~[?:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_282]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_282]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_282]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_282]
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:315) ~[spigot-1.16.5.jar:2991-Spigot-018b9a0-f3f3094]
... 14 more