ASkyBlock

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Generating the first island work fine, but having a second user try and create an island doesn't work..

They get the prompt and fill out the form, but it they don't get teleported to their island -- this is the error text

18:56:42 [ERROR] Throwing
java.lang.NullPointerException: null
        at com.larryTheCoder.island.IslandManager.generateIslandKey(IslandManager.java:284) ~[?:?]
        at com.larryTheCoder.cache.FastCache.getIslandData(FastCache.java:161) ~[?:?]
        at com.larryTheCoder.command.category.OperatorCategory.execute(OperatorCategory.java:236) ~[?:?]
        at com.larryTheCoder.command.Commands.execute(Commands.java:117) ~[?:?]
        at cn.nukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:257) ~[nukkit-1.0-SNAPSHOT.jar:?]
        at cn.nukkit.Server.dispatchCommand(Server.java:764) ~[nukkit-1.0-SNAPSHOT.jar:?]
        at cn.nukkit.Player.handleDataPacket(Player.java:2812) ~[nukkit-1.0-SNAPSHOT.jar:?]
        at java.util.ArrayList.forEach(ArrayList.java:1541) [?:?]
        at cn.nukkit.network.Network.processPackets(Network.java:268) [nukkit-1.0-SNAPSHOT.jar:?]
        at cn.nukkit.network.Network.processBatch(Network.java:251) [nukkit-1.0-SNAPSHOT.jar:?]
        at cn.nukkit.Player.handleDataPacket(Player.java:2102) [nukkit-1.0-SNAPSHOT.jar:?]
        at cn.nukkit.network.RakNetInterface.handleEncapsulated(RakNetInterface.java:156) [nukkit-1.0-SNAPSHOT.jar:?]
        at cn.nukkit.raknet.server.ServerHandler.handlePacket(ServerHandler.java:132) [nukkit-1.0-SNAPSHOT.jar:?]
        at cn.nukkit.network.RakNetInterface.process(RakNetInterface.java:65) [nukkit-1.0-SNAPSHOT.jar:?]
        at cn.nukkit.network.Network.processInterfaces(Network.java:152) [nukkit-1.0-SNAPSHOT.jar:?]
        at cn.nukkit.Server.tick(Server.java:1137) [nukkit-1.0-SNAPSHOT.jar:?]
        at cn.nukkit.Server.tickProcessor(Server.java:916) [nukkit-1.0-SNAPSHOT.jar:?]
        at cn.nukkit.Server.start(Server.java:893) [nukkit-1.0-SNAPSHOT.jar:?]
        at cn.nukkit.Server.<init>(Server.java:578) [nukkit-1.0-SNAPSHOT.jar:?]
        at cn.nukkit.Nukkit.main(Nukkit.java:112) [nukkit-1.0-SNAPSHOT.jar:?]

This is something new, I will try to test it with another user if you're correct.

Tested it here, couldn't find the possible cause of this issue, maybe the player attempts to use other than the original skyblock world?