Bukkit

What steps will reproduce the problem?
1. Run command for changing the warp type (in my case i was doing "/nws gifts listed" as a player with full permissions)
2. View the exception that gets thrown on the server console

What is the expected output? What do you see instead?
To change the warp type and not throw an exception

What version of the product are you using?
bukkit 1.2.4 R1
NiftyWarp v. 1.3.3

Do you have an error log of what happened?
org.bukkit.command.CommandException: Unhandled exception executing command 'nws' in plugin NiftyWarp v1.3.3
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:42)
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:166)
        at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:473)
        at net.minecraft.server.NetServerHandler.handleCommand(NetServerHandler.java:821)
        at net.minecraft.server.NetServerHandler.chat(NetServerHandler.java:781)
        at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:764)
        at net.minecraft.server.Packet3Chat.handle(Packet3Chat.java:33)
        at net.minecraft.server.NetworkManager.b(NetworkManager.java:229)
        at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:113)
        at net.minecraft.server.NetworkListenThread.a(NetworkListenThread.java:78)
        at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:554)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:452)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:490)
Caused by: javax.persistence.PersistenceException: The existing transaction is still active?
        at com.avaje.ebeaninternal.server.transaction.TransactionMap$State.set(TransactionMap.java:70)
        at com.avaje.ebeaninternal.server.transaction.DefaultTransactionThreadLocal.set(DefaultTransactionThreadLocal.java:62)
        at com.avaje.ebeaninternal.server.transaction.DefaultTransactionScopeManager.set(DefaultTransactionScopeManager.java:41)
        at com.avaje.ebeaninternal.server.core.DefaultServer.beginTransaction(DefaultServer.java:881)
        at net.niftymonkey.niftywarp.persistence.EbeanServerPersistenceProvider.update(EbeanServerPersistenceProvider.java:98)
        at net.niftymonkey.niftywarp.WarpManager.setWarpType(WarpManager.java:334)
        at net.niftymonkey.niftywarp.commands.SetWarpTypeCommand.onCommand(SetWarpTypeCommand.java:73)
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:40)
        ... 12 more

Please provide any additional information below.
I looked at the code and that line is a comment so that is quite interesting