Describe the bug
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To Reproduce
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2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
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Screenshots and Logs
[15:52:31 WARN]: Error connecting to the storage. The plugin will not work correctly.
[15:52:31 WARN]: org.h2.jdbc.JdbcSQLIntegrityConstraintViolationException: Unique index or primary key violation: "PUBLIC.PRIMARY_KEY_3 ON PUBLIC.JOBPLAYERS(UUID) VALUES 2"; SQL statement:
[15:52:31 WARN]: INSERT INTO jobplayers (uuid) VALUES (?) [23505-200]
[15:52:31 WARN]: at PicoJobs-1.0-beta-5.jar//org.h2.message.DbException.getJdbcSQLException(DbException.java:459)
[15:52:31 WARN]: at PicoJobs-1.0-beta-5.jar//org.h2.message.DbException.getJdbcSQLException(DbException.java:429)
[15:52:31 WARN]: at PicoJobs-1.0-beta-5.jar//org.h2.message.DbException.get(DbException.java:205)
[15:52:31 WARN]: at PicoJobs-1.0-beta-5.jar//org.h2.message.DbException.get(DbException.java:181)
[15:52:31 WARN]: at PicoJobs-1.0-beta-5.jar//org.h2.index.BaseIndex.getDuplicateKeyException(BaseIndex.java:103)
[15:52:31 WARN]: at PicoJobs-1.0-beta-5.jar//org.h2.mvstore.db.MVSecondaryIndex.checkUnique(MVSecondaryIndex.java:221)
[15:52:31 WARN]: at PicoJobs-1.0-beta-5.jar//org.h2.mvstore.db.MVSecondaryIndex.add(MVSecondaryIndex.java:196)
[15:52:31 WARN]: at PicoJobs-1.0-beta-5.jar//org.h2.mvstore.db.MVTable.addRow(MVTable.java:531)
[15:52:31 WARN]: at PicoJobs-1.0-beta-5.jar//org.h2.command.dml.Insert.insertRows(Insert.java:195)
[15:52:31 WARN]: at PicoJobs-1.0-beta-5.jar//org.h2.command.dml.Insert.update(Insert.java:151)
[15:52:31 WARN]: at PicoJobs-1.0-beta-5.jar//org.h2.command.CommandContainer.update(CommandContainer.java:198)
[15:52:31 WARN]: at PicoJobs-1.0-beta-5.jar//org.h2.command.Command.executeUpdate(Command.java:251)
[15:52:31 WARN]: at PicoJobs-1.0-beta-5.jar//org.h2.jdbc.JdbcPreparedStatement.executeUpdateInternal(JdbcPreparedStatement.java:191)
[15:52:31 WARN]: at PicoJobs-1.0-beta-5.jar//org.h2.jdbc.JdbcPreparedStatement.executeUpdate(JdbcPreparedStatement.java:152)
[15:52:31 WARN]: at PicoJobs-1.0-beta-5.jar//com.gmail.picono435.picojobs.storage.sql.file.FlatfileStorageFactory.createPlayer(FlatfileStorageFactory.java:54)
[15:52:31 WARN]: at PicoJobs-1.0-beta-5.jar//com.gmail.picono435.picojobs.api.managers.PlayersManager.lambda$getJobPlayerFromStorage$2(PlayersManager.java:102)
[15:52:31 WARN]: at org.bukkit.craftbukkit.v1_18_R1.scheduler.CraftTask.run(CraftTask.java:101)
[15:52:31 WARN]: at org.bukkit.craftbukkit.v1_18_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:57)
[15:52:31 WARN]: at com.destroystokyo.paper.ServerSchedulerReportingWrapper.run(ServerSchedulerReportingWrapper.java:22)
[15:52:31 WARN]: at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
[15:52:31 WARN]: at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
[15:52:31 WARN]: at java.base/java.lang.Thread.run(Thread.java:833)

Software Details:

• Server Software: Paper
• Server Software Version: 1.18.1-RO.1-SNAPSHOT
• Plugin Version: 1.0-beta-5
• Java Version: 1.8.0_311

Additional context
Add any other context about the problem here.

Duplicate of #150