Exception on Server Start

[Ringwid]

This error occurs every time I start my server.
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: All parts of a PRIMARY KEY must be NOT NULL; if you need NULL in a key, use UNIQUE instead at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) at com.mysql.jdbc.Util.handleNewInstance(Util.java:425) at com.mysql.jdbc.Util.getInstance(Util.java:408) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:943) at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3973) at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3909) at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2527) at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2680) at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2487) at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1858) at com.mysql.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement.java:2079) at com.mysql.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement.java:2013) at com.mysql.jdbc.PreparedStatement.executeLargeUpdate(PreparedStatement.java:5104) at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1998) at com.greatmancode.com.zaxxer.libs.hikari.pool.ProxyPreparedStatement.executeUpdate(ProxyPreparedStatement.java:61) at com.greatmancode.com.zaxxer.libs.hikari.pool.HikariProxyPreparedStatement.executeUpdate(HikariProxyPreparedStatement.java) at com.greatmancode.craftconomy3.storage.sql.MySQLEngine.<init>(MySQLEngine.java:83) at com.greatmancode.craftconomy3.storage.StorageHandler.<init>(StorageHandler.java:40) at com.greatmancode.craftconomy3.Common.initialiseDatabase(Common.java:397) at com.greatmancode.craftconomy3.Common.onEnable(Common.java:144) at com.greatmancode.craftconomy3.tools.interfaces.BukkitLoader.onEnable(BukkitLoader.java:49) at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:264) at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:316) at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:405) at org.bukkit.craftbukkit.v1_12_R1.CraftServer.enablePlugin(CraftServer.java:384) at org.bukkit.craftbukkit.v1_12_R1.CraftServer.enablePlugins(CraftServer.java:333) at net.minecraft.server.v1_12_R1.MinecraftServer.t(MinecraftServer.java:442) at net.minecraft.server.v1_12_R1.MinecraftServer.l(MinecraftServer.java:403) at net.minecraft.server.v1_12_R1.MinecraftServer.a(MinecraftServer.java:341) at net.minecraft.server.v1_12_R1.DedicatedServer.init(DedicatedServer.java:292) at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:616) at java.lang.Thread.run(Thread.java:748)

[JohOply]

Solution here #132