my server rollback every times but i dont find any problems. this is the error when i save my worlds: Code: ---- Minecraft Crash Report ---- // Oh - I know what I did wrong! Time: 14/10/12 23:53 Description: Exception in server tick loop java.lang.NullPointerException at net.minecraft.server.DedicatedServer.ai(DedicatedServer.java:245) at net.minecraft.server.DedicatedServer.a(DedicatedServer.java:192) at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:412) at net.minecraft.server.ThreadServerApplication.run(SourceFile:539) Relevant Details: - Minecraft Version: 1.3.2 - Operating System: Linux (amd64) version 3.2.13-grsec-xxxx-grs-ipv6-64 - Java Version: 1.7.0_06, Oracle Corporation - Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation - Memory: 968203992 bytes (923 MB) / 1004929024 bytes (958 MB) up to 9320726528 bytes (8888 MB) - JVM Flags: 2 total; -Xms1000M -Xmx10000M - CraftBukkit Information: Running: Failed to handle CraftCrashReport: java.lang.NullPointerException at org.bukkit.Bukkit.getName(Bukkit.java:67) at org.bukkit.craftbukkit.CraftCrashReport.call(CraftCrashReport.java:20) at net.minecraft.server.CrashReport.a(CrashReport.java:43) at net.minecraft.server.CrashReport.g(CrashReport.java:38) at net.minecraft.server.CrashReport.<init>(CrashReport.java:28) at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:422) at net.minecraft.server.ThreadServerApplication.run(SourceFile:539) - Is Modded: Definitely; 'craftbukkit' - Profiler Position: N/A (disabled) - Type: Dedicated Server