Bukkit

Describe to us the issue that you're having:
Every time a player joins a concurrent modification error occurs

Which steps will reproduce this problem?:
1) Join
....

Do you have an error log of what happened?
14.01 23:10:09 [Server] INFO UUID of player Maximvdw is 3f9820d2-e539-4c63-80a3-1c6af31d7fdd
14.01 23:10:09 [Connect] User Maximvdw, IP xxxxxxxxxxxxxxxxxx
14.01 23:10:09 [Server] WARN java.util.ConcurrentModificationException
14.01 23:10:09 [Server] WARN at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429)
14.01 23:10:09 [Server] WARN at java.util.HashMap$ValueIterator.next(HashMap.java:1458)
14.01 23:10:09 [Server] WARN at java.util.AbstractCollection.addAll(AbstractCollection.java:343)
14.01 23:10:09 [Server] WARN at java.util.HashSet.<init>(HashSet.java:119)
14.01 23:10:09 [Server] WARN at org.bukkit.permissions.PermissibleBase.getEffectivePermissions(PermissibleBase.java:232)
14.01 23:10:09 [Server] WARN at org.bukkit.craftbukkit.v1_8_R2.entity.CraftHumanEntity.getEffectivePermissions(CraftHumanEntity.java:139)
14.01 23:10:09 [Server] WARN at de.bananaco.bpermissions.imp.BukkitCompat.doBukkitPermissions(BukkitCompat.java:84)
14.01 23:10:09 [Server] WARN at de.bananaco.bpermissions.imp.BukkitCompat.setPermissions(BukkitCompat.java:38)
14.01 23:10:09 [Server] WARN at de.bananaco.bpermissions.imp.SuperPermissionHandler.setPermissions(SuperPermissionHandler.java:45)
14.01 23:10:09 [Server] WARN at de.bananaco.bpermissions.imp.SuperPermissionHandler.setupPlayer(SuperPermissionHandler.java:85)
14.01 23:10:09 [Server] WARN at de.bananaco.bpermissions.imp.SuperPermissionHandler$3.run(SuperPermissionHandler.java:176)
14.01 23:10:09 [Server] WARN at org.bukkit.craftbukkit.v1_8_R2.scheduler.CraftTask.run(CraftTask.java:71)
14.01 23:10:09 [Server] WARN at org.bukkit.craftbukkit.v1_8_R2.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:53)
14.01 23:10:09 [Server] WARN at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
14.01 23:10:09 [Server] WARN at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
14.01 23:10:09 [Server] WARN at java.lang.Thread.run(Thread.java:745)

Which version of bPermissions are you using?: (Please don't say "latest"!!!) 2.12 B7

Which version of CraftBukkit?: (Please don't say "latest"!!!) 1.8.8 Spigot

Which OS? Linux

I'm aware of the issue, and it will be fixed before the release of 2.12

Should be fixed now - if I don't get any more reports I will mark as fixed