[19:49:56 WARN]: [JetsPrisonMines] Task #4108 for JetsPrisonMines v2.7.0 generated an exception
java.lang.IllegalArgumentException: Plugin cannot be null
        at org.apache.commons.lang.Validate.notNull(Validate.java:192) ~[patched_1.13.2.jar:git-Paper-629]
        at org.bukkit.craftbukkit.v1_13_R2.scheduler.CraftScheduler.validate(CraftScheduler.java:511) ~[patched_1.13.2.jar:git-Paper-629]
        at org.bukkit.craftbukkit.v1_13_R2.scheduler.CraftScheduler.runTaskTimer(CraftScheduler.java:196) ~[patched_1.13.2.jar:git-Paper-629]
        at org.bukkit.craftbukkit.v1_13_R2.scheduler.CraftScheduler.runTaskTimer(CraftScheduler.java:187) ~[patched_1.13.2.jar:git-Paper-629]
        at org.bukkit.scheduler.BukkitRunnable.runTaskTimer(BukkitRunnable.java:117) ~[patched_1.13.2.jar:git-Paper-629]        at me.jet315.prisonmines.mine.reset.GradualReset.reset(GradualReset.java:48) ~[?:?]
        at me.jet315.prisonmines.mine.Mine$3$1.run(Mine.java:264) ~[?:?]
        at org.bukkit.craftbukkit.v1_13_R2.scheduler.CraftTask.run(CraftTask.java:84) ~[patched_1.13.2.jar:git-Paper-629]
        at org.bukkit.craftbukkit.v1_13_R2.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:449) ~[patched_1.13.2.jar:git-Paper-629]
        at net.minecraft.server.v1_13_R2.MinecraftServer.b(MinecraftServer.java:1010) ~[patched_1.13.2.jar:git-Paper-629]
        at net.minecraft.server.v1_13_R2.DedicatedServer.b(DedicatedServer.java:439) ~[patched_1.13.2.jar:git-Paper-629]        at net.minecraft.server.v1_13_R2.MinecraftServer.a(MinecraftServer.java:940) ~[patched_1.13.2.jar:git-Paper-629]        at net.minecraft.server.v1_13_R2.MinecraftServer.run(MinecraftServer.java:837) ~[patched_1.13.2.jar:git-Paper-629]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_201]