//Update the weather for all worlds
for (World world : Bukkit.getWorlds()) {
    world.setStorm(stormActive);
}

[16:04:25] [Server thread/INFO]: [Username] issued server command: /pstorm on
[16:04:25] [Server thread/INFO]: [EndlessSnow] Persistent storm enabled
[16:04:25] [Server thread/ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'pstorm' in plugin EndlessSnow v1.2.0
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:47)
    at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:150)
    at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:935)
    at org.bukkit.craftbukkit.command.BukkitCommandWrapper.run(BukkitCommandWrapper.java:50)
    at com.mojang.brigadier.context.ContextChain.runExecutable(ContextChain.java:73)
    at net.minecraft.commands.execution.tasks.ExecuteCommand.execute(ExecuteCommand.java:29)
    at net.minecraft.commands.execution.tasks.ExecuteCommand.execute(ExecuteCommand.java:13)
    at net.minecraft.commands.execution.UnboundEntryAction.lambda$bind$0(UnboundEntryAction.java:8)
    at net.minecraft.commands.execution.CommandQueueEntry.execute(CommandQueueEntry.java:8)
    at net.minecraft.commands.execution.ExecutionContext.runCommandQueue(ExecutionContext.java:106)
    at net.minecraft.commands.Commands.executeCommandInContext(Commands.java:480)
    at net.minecraft.commands.Commands.performCommand(Commands.java:403)
    at net.minecraft.commands.Commands.performCommand(Commands.java:390)
    at net.minecraft.server.network.ServerGamePacketListenerImpl.performUnsignedChatCommand(ServerGamePacketListenerImpl.java:2190)
    at net.minecraft.server.network.ServerGamePacketListenerImpl.lambda$handleChatCommand$0(ServerGamePacketListenerImpl.java:2166)
    at net.minecraft.server.TickTask.run(TickTask.java:18)
    at net.minecraft.util.thread.BlockableEventLoop.doRunTask(BlockableEventLoop.java:173)
    at net.minecraft.util.thread.ReentrantBlockableEventLoop.doRunTask(ReentrantBlockableEventLoop.java:23)
    at net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:1348)
    at net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:231)
    at net.minecraft.util.thread.BlockableEventLoop.pollTask(BlockableEventLoop.java:147)
    at net.minecraft.server.MinecraftServer.pollTaskInternal(MinecraftServer.java:1331)
    at net.minecraft.server.MinecraftServer.pollTask(MinecraftServer.java:1324)
    at net.minecraft.util.thread.BlockableEventLoop.managedBlock(BlockableEventLoop.java:156)
    at net.minecraft.server.MinecraftServer.waitUntilNextTick(MinecraftServer.java:1291)
    at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1155)
    at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:358)
    at java.base/java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException: Cannot invoke "net.minecraft.server.level.ServerLevel.getWorld()" because "this.world" is null
    at net.minecraft.world.level.saveddata.WeatherData.setRaining(WeatherData.java:95)
    at org.bukkit.craftbukkit.CraftWorld.setStorm(CraftWorld.java:1116)
    at io.github.stuarthayhurst.endlesssnow.EndlessSnow.setStormActive(EndlessSnow.java:77)
    at io.github.stuarthayhurst.endlesssnow.StormCommand.onCommand(StormCommand.java:38)
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:45)
    ... 27 more