[12:35:03 ERROR]: Uh oh! You've found an error in Core.
This is an error caused while running your code, so you may be able to find a workaround, but is ultimately an error in Core itself.
The line of code that caused the error was this:
@profile = {database: {db}, host: {host}, password: {password}, type: mysql, username: {username}}
@uuid = 'fa93a819-4b23-4c06-89ba-cc60721808ed'
query(@profile, 'SELECT * FROM PlayerStats LEFT JOIN Minigames ON PlayerStats.minigame_id = Minigames.minigame_id WHERE Minigames.name = ? AND PlayerStats.player_id = ? AND stat = \'time_min\'', 'Race_5', @uuid)
on or around D:\Server\plugins\CommandHelper\config.txt:1276.
Please report this error to the developers, and be sure to include the version numbers:
Server version: 1.12-R0.1-SNAPSHOT;
CommandHelper version: 3.3.2-SNAPSHOT.3216-;
Loaded extensions and versions:
CHHTTPd (version 0.0.2);
${project.name} (version 2.1.0);
SKCompat (version 2.1.0);
Core (version 3.3.2);
CHVirtualChests (version 1.0.5);
CHIRC (version 0.0.1);
CHWorldGuard (version 1.1.0);
CHNaughty (version 3.4.3);
CHSpigot (version 1.5.1);
Here's the stacktrace:
java.lang.NullPointerException
        at com.laytonsmith.core.functions.SQL$query.exec(SQL.java:251)
        at com.laytonsmith.core.Script.eval(Script.java:375)
        at com.laytonsmith.core.Script.eval(Script.java:344)
        at com.laytonsmith.core.Script.eval(Script.java:344)
        at com.laytonsmith.core.MethodScriptCompiler.execute(MethodScriptCompiler.java:2001)
        at com.laytonsmith.core.MethodScriptCompiler.execute(MethodScriptCompiler.java:1958)
        at com.laytonsmith.core.Script.run(Script.java:207)
        at com.laytonsmith.core.AliasCore.alias(AliasCore.java:153)
        at com.laytonsmith.commandhelper.CommandHelperListener.runAlias(CommandHelperListener.java:80)
        at com.laytonsmith.commandhelper.CommandHelperListener.onPlayerCommandPreprocess(CommandHelperListener.java:112)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302)
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:499)
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:484)
        at net.minecraft.server.v1_12_R1.PlayerConnection.handleCommand(PlayerConnection.java:1377)
        at net.minecraft.server.v1_12_R1.PlayerConnection.a(PlayerConnection.java:1220)
        at net.minecraft.server.v1_12_R1.PacketPlayInChat.a(PacketPlayInChat.java:45)
        at net.minecraft.server.v1_12_R1.PacketPlayInChat.a(PacketPlayInChat.java:1)
        at net.minecraft.server.v1_12_R1.PlayerConnectionUtils$1.run(SourceFile:13)
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
        at java.util.concurrent.FutureTask.run(Unknown Source)
        at net.minecraft.server.v1_12_R1.SystemUtils.a(SourceFile:46)
        at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:747)
        at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:405)
        at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:678)
        at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:576)
        at java.lang.Thread.run(Unknown Source)