[18:10:34 WARN]: java.util.ConcurrentModificationException
[18:10:34 WARN]:        at java.base/java.util.ArrayList$Itr.checkForComodification(ArrayList.java:1043)
[18:10:34 WARN]:        at java.base/java.util.ArrayList$Itr.next(ArrayList.java:997)
[18:10:34 WARN]:        at de.marcely.bedwars.br.save(LobbyConfig.java:167)
[18:10:34 WARN]:        at de.marcely.bedwars.br.G(LobbyConfig.java:141)
[18:10:34 WARN]:        at de.marcely.bedwars.config.Config$2.run(Config.java:1709)
[18:10:34 WARN]:        at de.marcely.bedwars.config.Config.a(Config.java:1720)
[18:10:34 WARN]:        at de.marcely.bedwars.config.Config.a(Config.java:1626)
[18:10:34 WARN]:        at de.marcely.bedwars.MBedwars.init(MBedwars.java:234)
[18:10:34 WARN]:        at de.marcely.bedwars.MBedwars.onEnable(MBedwars.java:91)
[18:10:34 WARN]:        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:263)
[18:10:34 WARN]:        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:370)
[18:10:34 WARN]:        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:500)
[18:10:34 WARN]:        at org.bukkit.craftbukkit.v1_16_R3.CraftServer.enablePlugin(CraftServer.java:518)
[18:10:34 WARN]:        at org.bukkit.craftbukkit.v1_16_R3.CraftServer.enablePlugins(CraftServer.java:432)
[18:10:34 WARN]:        at net.minecraft.server.v1_16_R3.MinecraftServer.loadWorld(MinecraftServer.java:596)
[18:10:34 WARN]:        at net.minecraft.server.v1_16_R3.DedicatedServer.init(DedicatedServer.java:309)
[18:10:34 WARN]:        at net.minecraft.server.v1_16_R3.MinecraftServer.w(MinecraftServer.java:1074)
[18:10:34 WARN]:        at net.minecraft.server.v1_16_R3.MinecraftServer.lambda$a$0(MinecraftServer.java:293)
[18:10:34 WARN]:        at java.base/java.lang.Thread.run(Thread.java:829)