I'm not a dummy, so I've checked these

• I am not using any other permission management plugin
• I use the latest available version of PowerRanks
• I am a human

Describe the bug
Sometimes PR loses it ranks and permission, i tried to reload/unload the plugin but it wont help.

To Reproduce
i dunno :L

Expected behavior
A clear and concise description of what you expected to happen.
Not happen this again
Screenshots
https://cdn.discordapp.com/attachments/710835410070274049/848470043847426048/unknown.png

Logs
[08:55:53 WARN]: java.lang.NullPointerException
[08:55:53 WARN]: java.lang.NullPointerException
[08:55:54 WARN]: [PowerRanks] Task #31659930 for PowerRanks v1.9.9R3 generated an exception
java.lang.NullPointerException: null
at nl.svenar.PowerRanks.PowerRanks.updatePlaytime(PowerRanks.java:952) ~[?:?]
at nl.svenar.PowerRanks.PowerRanks$3.run(PowerRanks.java:355) ~[?:?]
at org.bukkit.craftbukkit.v1_16_R3.scheduler.CraftTask.run(CraftTask.java:100) ~[patched_1.16.5.jar:git-Paper-634]
at org.bukkit.craftbukkit.v1_16_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:468) ~[patched_1.16.5.jar:git-Paper-634]
at net.minecraft.server.v1_16_R3.MinecraftServer.b(MinecraftServer.java:1423) ~[patched_1.16.5.jar:git-Paper-634]
at net.minecraft.server.v1_16_R3.DedicatedServer.b(DedicatedServer.java:419) ~[patched_1.16.5.jar:git-Paper-634]
at net.minecraft.server.v1_16_R3.MinecraftServer.a(MinecraftServer.java:1338) ~[patched_1.16.5.jar:git-Paper-634]
at net.minecraft.server.v1_16_R3.MinecraftServer.w(MinecraftServer.java:1126) ~[patched_1.16.5.jar:git-Paper-634]
at net.minecraft.server.v1_16_R3.MinecraftServer.lambda$a$0(MinecraftServer.java:289) ~[patched_1.16.5.jar:git-Paper-634]
at java.lang.Thread.run(Thread.java:834) [?:?]
[08:55:54 WARN]: java.lang.NullPointerException
[08:55:55 WARN]: java.lang.NullPointerException

Desktop (please complete the following information):

• OS: Linux
• Server type paper 1.16.5
• Minecraft Version 1.16.5
• PowerRanks version 1.9.9R3

Additional context
Add any other context about the problem here.

Can you send the ranks.yml, config.yml, and list of plugins? 1.9.9R2/3 also is a bit buggy so see if the same issue arises in 1.9.8