[14:53:59 WARN]: [Zombies] Task #12 for Zombies v1.0.4 generated an exception
java.lang.NullPointerException: null
        at Zombies.GameArena.handlePracticeDummy(GameArena.java:421) ~[?:?]
        at Zombies.GameArena.loadLobby(GameArena.java:484) ~[?:?]
        at Zombies.GameArena.<init>(GameArena.java:206) ~[?:?]
        at Zombies.Configuration.loadMap(Configuration.java:984) ~[?:?]
        at Zombies.Configuration$1.run(Configuration.java:963) ~[?:?]
        at org.bukkit.craftbukkit.v1_13_R2.scheduler.CraftTask.run(CraftTask.java:84) ~[spigot.jar:git-Paper-616]
        at org.bukkit.craftbukkit.v1_13_R2.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:449) ~[spigot.jar:git-Paper-616]
        at net.minecraft.server.v1_13_R2.MinecraftServer.b(MinecraftServer.java:1010) ~[spigot.jar:git-Paper-616]
        at net.minecraft.server.v1_13_R2.DedicatedServer.b(DedicatedServer.java:439) ~[spigot.jar:git-Paper-616]
        at net.minecraft.server.v1_13_R2.MinecraftServer.a(MinecraftServer.java:940) ~[spigot.jar:git-Paper-616]
        at net.minecraft.server.v1_13_R2.MinecraftServer.run(MinecraftServer.java:837) ~[spigot.jar:git-Paper-616]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_211]