After startup of the server I get following error:

2012-04-25 13:46:58 [SEVERE] java.lang.NullPointerException
2012-04-25 13:46:58 [SEVERE]    at net.milkbowl.vault.Metrics.postPlugin(Metrics.java:335)
2012-04-25 13:46:58 [SEVERE]    at net.milkbowl.vault.Metrics.access$100(Metrics.java:62)
2012-04-25 13:46:58 [SEVERE]    at net.milkbowl.vault.Metrics$4.run(Metrics.java:245)
2012-04-25 13:46:58 [SEVERE]    at org.bukkit.craftbukkit.scheduler.CraftWorker.run(CraftWorker.java:34)
2012-04-25 13:46:58 [SEVERE]    at java.lang.Thread.run(Thread.java:662)

I use following plugins with 1.2.5-R1.2:

>pl
13:46:49 [INFO] Plugins (18): TeleHunger, MinecartRevolution, CraftBookCommon, Safe Creeper, xWarp, Backup, Vault, Lockette, PermissionsEx, Modifyworld, Lava Forge, Herochat, Qukkiz, CraftBookCircuits, LoginMessage, Essentials, dynmap, CraftBookMechanisms

Fabian

not sure why the response would ever return null, but I've accounted for a null response now, so it's fixed in the latest dev, The error happening wont detrimentally affect your server so you can ignore it until you patch.