Hi there i tryied 1.3.2 but:
-Message on startup:
[13:22:42 INFO]: Enabled plugin BungeeBlockVersion version 1.3.2 by hyperdefined
[13:22:42 INFO] [BungeeBlockVersion]: There is a new version available! Please download at https://www.spigotmc.org/resources/bungeeblockversion.84685/

-I havent touched the config file yet so all clients should be rejected right?
i tried both 1.17.1 client and 1.18 client and they were not blocked by the proxy

Using 1.18 Waterfall : https://papermc.io/api/v2/projects/waterfall/versions/1.18/builds/462/downloads/waterfall-1.18-462.jar

Your plugin at Spigot page said that plugin works from 1.7 to 1.20 but when i want to block version number from 0 to 46, it says "Version # is NOT a valid version number! Ignoring this version."

[09:28:11 WARN]: Error dispatching event ProxyPingEvent(connection=[/138.201.173.70:42580] <-> InitialHandler, response=ServerPing(version=ServerPing.Protocol(name=FlameCord 1.8.x-1.17.x, protocol=756), players=ServerPing.Players(max=1000, online=0, sample=[ServerPing.PlayerInfo(name= (✦) INFORMACE (✦) , uniqueId=00000000-0000-0000-0000-000000000000), ServerPing.PlayerInfo(name=, uniqueId=00000000-0000-0000-0000-000000000000), ServerPing.PlayerInfo(name= www.elite-raid.eu, uniqueId=00000000-0000-0000-0000-000000000000), ServerPing.PlayerInfo(name= store.elite-raid.eu, uniqueId=00000000-0000-0000-0000-000000000000), ServerPing.PlayerInfo(name= play.elite-raid.eu, uniqueId=00000000-0000-0000-0000-000000000000), ServerPing.PlayerInfo(name= discord.elite-raid.eu, uniqueId=00000000-0000-0000-0000-000000000000), ServerPing.PlayerInfo(name=, uniqueId=00000000-0000-0000-0000-000000000000)]), description= (✦) ELITE-RAID (✦) 20% SLEVA! Kód PRAZDNINY (store.elite-raid.eu), modinfo=ServerPing.ModInfo(type=FML, modList=[]))) to listener lol.hyper.bungeeblockversion.BungeeBlockVersion@7a491a60 java.util.NoSuchElementException: null at java.util.ArrayList$Itr.next(Unknown Source) ~[?:?] at java.util.Collections.min(Unknown Source) ~[?:?] at lol.hyper.bungeeblockversion.VersionToStrings.allowedVersions(VersionToStrings.java:69) ~[?:?] at lol.hyper.bungeeblockversion.BungeeBlockVersion.onServerPing(BungeeBlockVersion.java:88) ~[?:?] at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?] at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:?] at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:?] at java.lang.reflect.Method.invoke(Unknown Source) ~[?:?] at net.md_5.bungee.event.EventHandlerMethod.invoke(EventHandlerMethod.java:19) ~[FlameCord.jar:git:FlameCord-Bootstrap:1.17-R0.1-SNAPSHOT:7912bef:unknown] at net.md_5.bungee.event.EventBus.post(EventBus.java:48) ~[FlameCord.jar:git:FlameCord-Bootstrap:1.17-R0.1-SNAPSHOT:7912bef:unknown] at net.md_5.bungee.api.plugin.PluginManager.callEvent(PluginManager.java:510) ~[FlameCord.jar:git:FlameCord-Bootstrap:1.17-R0.1-SNAPSHOT:7912bef:unknown] at net.md_5.bungee.connection.InitialHandler$3.done(InitialHandler.java:290) ~[FlameCord.jar:git:FlameCord-Bootstrap:1.17-R0.1-SNAPSHOT:7912bef:unknown] at net.md_5.bungee.connection.InitialHandler$3.done(InitialHandler.java:257) ~[FlameCord.jar:git:FlameCord-Bootstrap:1.17-R0.1-SNAPSHOT:7912bef:unknown] at net.md_5.bungee.connection.InitialHandler.handle(InitialHandler.java:299) ~[FlameCord.jar:git:FlameCord-Bootstrap:1.17-R0.1-SNAPSHOT:7912bef:unknown] at net.md_5.bungee.protocol.packet.StatusRequest.handle(StatusRequest.java:30) ~[FlameCord.jar:git:FlameCord-Bootstrap:1.17-R0.1-SNAPSHOT:7912bef:unknown] at net.md_5.bungee.netty.HandlerBoss.channelRead(HandlerBoss.java:128) ~[FlameCord.jar:git:FlameCord-Bootstrap:1.17-R0.1-SNAPSHOT:7912bef:unknown] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[FlameCord.jar:git:FlameCord-Bootstrap:1.17-R0.1-SNAPSHOT:7912bef:unknown] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[FlameCord.jar:git:FlameCord-Bootstrap:1.17-R0.1-SNAPSHOT:7912bef:unknown] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) ~[FlameCord.jar:git:FlameCord-Bootstrap:1.17-R0.1-SNAPSHOT:7912bef:unknown] at io.netty.handler.timeout.IdleStateHandler.channelRead(IdleStateHandler.java:286) ~[FlameCord.jar:git:FlameCord-Bootstrap:1.17-R0.1-SNAPSHOT:7912bef:unknown] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[FlameCord.jar:git:FlameCord-Bootstrap:1.17-R0.1-SNAPSHOT:7912bef:unknown] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[FlameCord.jar:git:FlameCord-Bootstrap:1.17-R0.1-SNAPSHOT:7912bef:unknown] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) ~[FlameCord.jar:git:FlameCord-Bootstrap:1.17-R0.1-SNAPSHOT:7912bef:unknown] at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103) ~[FlameCord.jar:git:FlameCord-Bootstrap:1.17-R0.1-SNAPSHOT:7912bef:unknown] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[FlameCord.jar:git:FlameCord-Bootstrap:1.17-R0.1-SNAPSHOT:7912bef:unknown] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[FlameCord.jar:git:FlameCord-Bootstrap:1.17-R0.1-SNAPSHOT:7912bef:unknown] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) ~[FlameCord.jar:git:FlameCord-Bootstrap:1.17-R0.1-SNAPSHOT:7912bef:unknown] at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103) ~[FlameCord.jar:git:FlameCord-Bootstrap:1.17-R0.1-SNAPSHOT:7912bef:unknown] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[FlameCord.jar:git:FlameCord-Bootstrap:1.17-R0.1-SNAPSHOT:7912bef:unknown] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[FlameCord.jar:git:FlameCord-Bootstrap:1.17-R0.1-SNAPSHOT:7912bef:unknown] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) ~[FlameCord.jar:git:FlameCord-Bootstrap:1.17-R0.1-SNAPSHOT:7912bef:unknown] at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:324) ~[FlameCord.jar:git:FlameCord-Bootstrap:1.17-R0.1-SNAPSHOT:7912bef:unknown] at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:296) ~[FlameCord.jar:git:FlameCord-Bootstrap:1.17-R0.1-SNAPSHOT:7912bef:unknown] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[FlameCord.jar:git:FlameCord-Bootstrap:1.17-R0.1-SNAPSHOT:7912bef:unknown] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[FlameCord.jar:git:FlameCord-Bootstrap:1.17-R0.1-SNAPSHOT:7912bef:unknown] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) ~[FlameCord.jar:git:FlameCord-Bootstrap:1.17-R0.1-SNAPSHOT:7912bef:unknown] at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410) ~[FlameCord.jar:git:FlameCord-Bootstrap:1.17-R0.1-SNAPSHOT:7912bef:unknown] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[FlameCord.jar:git:FlameCord-Bootstrap:1.17-R0.1-SNAPSHOT:7912bef:unknown] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[FlameCord.jar:git:FlameCord-Bootstrap:1.17-R0.1-SNAPSHOT:7912bef:unknown] at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919) ~[FlameCord.jar:git:FlameCord-Bootstrap:1.17-R0.1-SNAPSHOT:7912bef:unknown] at io.netty.channel.epoll.AbstractEpollStreamChannel$EpollStreamUnsafe.epollInReady(AbstractEpollStreamChannel.java:795) ~[FlameCord.jar:git:FlameCord-Bootstrap:1.17-R0.1-SNAPSHOT:7912bef:unknown] at io.netty.channel.epoll.EpollEventLoop.processReady(EpollEventLoop.java:480) ~[FlameCord.jar:git:FlameCord-Bootstrap:1.17-R0.1-SNAPSHOT:7912bef:unknown] at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:378) ~[FlameCord.jar:git:FlameCord-Bootstrap:1.17-R0.1-SNAPSHOT:7912bef:unknown] at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989) ~[FlameCord.jar:git:FlameCord-Bootstrap:1.17-R0.1-SNAPSHOT:7912bef:unknown] at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[FlameCord.jar:git:FlameCord-Bootstrap:1.17-R0.1-SNAPSHOT:7912bef:unknown] at java.lang.Thread.run(Unknown Source) [?:?]