SQL - No operations allowed after connection closed.

[Artucuno]

Hey, I just randomly started receiving this error

[16:00:34 WARN]: java.sql.SQLNonTransientConnectionException: No operations allowed after connection closed.
[16:00:34 WARN]:        at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:110)
[16:00:34 WARN]:        at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:97)
[16:00:34 WARN]:        at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:89)
[16:00:34 WARN]:        at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:63)
[16:00:34 WARN]:        at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:73)
[16:00:34 WARN]:        at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:73)
[16:00:34 WARN]:        at com.mysql.cj.jdbc.ConnectionImpl.prepareStatement(ConnectionImpl.java:1645)
[16:00:34 WARN]:        at com.mysql.cj.jdbc.ConnectionImpl.prepareStatement(ConnectionImpl.java:1559)
[16:00:34 WARN]:        at MineChess.jar//mc.ajneb97.mysql.MySQL$1.run(MySQL.java:72)
[16:00:34 WARN]:        at org.bukkit.craftbukkit.v1_19_R3.scheduler.CraftTask.run(CraftTask.java:101)
[16:00:34 WARN]:        at org.bukkit.craftbukkit.v1_19_R3.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:57)
[16:00:34 WARN]:        at com.destroystokyo.paper.ServerSchedulerReportingWrapper.run(ServerSchedulerReportingWrapper.java:22)
[16:00:34 WARN]:        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
[16:00:34 WARN]:        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
[16:00:34 WARN]:        at java.base/java.lang.Thread.run(Thread.java:833)