I didn't test the plugin, but I decided to write a review, because I read the review below, and the author's answer to it, and it became very funny to me xD

java.lang.NullPointerException: Cannot invoke "me.dreamdevs.github.claimdrop.database.Database.loadData(org.bukkit.entity.Player)" because the return value of "me.dreamdevs.github.claimdrop.ClaimDropMain.getDatabase()" is null
at me.dreamdevs.github.claimdrop.listeners.PlayerListeners.joinEvent(PlayerListeners.java:65) ~[ClaimDrop-1.0.2.jar:?]
at com.destroystokyo.paper.event.executor.asm.generated.GeneratedEventExecutor804.execute(Unknown Source) ~[?:?]
at org.bukkit.plugin.EventExecutor$2.execute(EventExecutor.java:77) ~[purpur-api-1.19.3-R0.1-SNAPSHOT.jar:?]
at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:80) ~[purpur-api-1.19.3-R0.1-SNAPSHOT.jar:git-Purpur-1933]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70) ~[purpur-api-1.19.3-R0.1-SNAPSHOT.jar:?]
at io.papermc.paper.plugin.manager.PaperEventManager.callEvent(PaperEventManager.java:54) ~[purpur-1.19.3.jar:git-Purpur-1933]
at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.callEvent(PaperPluginManagerImpl.java:126) ~[purpur-1.19.3.jar:git-Purpur-1933]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:617) ~[purpur-api-1.19.3-R0.1-SNAPSHOT.jar:?]
at net.minecraft.server.players.PlayerList.placeNewPlayer(PlayerList.java:319) ~[purpur-1.19.3.jar:git-Purpur-1933]
at net.minecraft.server.network.ServerLoginPacketListenerImpl.placeNewPlayer(ServerLoginPacketListenerImpl.java:202) ~[?:?]
at net.minecraft.server.network.ServerLoginPacketListenerImpl.handleAcceptedLogin(ServerLoginPacketListenerImpl.java:183) ~[?:?]
at net.minecraft.server.network.ServerLoginPacketListenerImpl.tick(ServerLoginPacketListenerImpl.java:85) ~[?:?]
at net.minecraft.network.Connection.tick(Connection.java:594) ~[?:?]
at net.minecraft.server.network.ServerConnectionListener.tick(ServerConnectionListener.java:233) ~[?:?]
at net.minecraft.server.MinecraftServer.tickChildren(MinecraftServer.java:1594) ~[purpur-1.19.3.jar:git-Purpur-1933]
at net.minecraft.server.dedicated.DedicatedServer.tickChildren(DedicatedServer.java:488) ~[purpur-1.19.3.jar:git-Purpur-1933]
at net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:1424) ~[purpur-1.19.3.jar:git-Purpur-1933]
at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1194) ~[purpur-1.19.3.jar:git-Purpur-1933]
at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:321) ~[purpur-1.19.3.jar:git-Purpur-1933]
at java.lang.Thread.run(Thread.java:833) ~[?:?]