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I've been playing minecraft for about 6 months now and just recently I have been having problems. I can't seem to play for 1-10 minutes of minecraft without it crashing and every time I have been getting crash reports. I played my account on another computer and no problem so I am beginning to think its my computer can I get any help? I am running on a 2009 macbook pro and I have the Mac OS X 10.6.8 version. I think Im running java 9.

---- Minecraft Crash Report ----
// This doesn't make any sense!

Time: 5/2/13 2:19 PM
Description: Exception while ticking a block

java.lang.NullPointerException
at java.util.TreeMap.fixAfterInsertion(TreeMap.java:2074)
at java.util.TreeMap.put(TreeMap.java:559)
at java.util.TreeSet.add(TreeSet.java:238)
at iz.a(SourceFile:346)
at iz.a(SourceFile:318)
at aml.a(SourceFile:125)
at iz.a(SourceFile:430)
at iz.b(SourceFile:142)
at net.minecraft.server.MinecraftServer.r(SourceFile:454)
at net.minecraft.server.MinecraftServer.q(SourceFile:397)
at bjg.q(SourceFile:122)
at net.minecraft.server.MinecraftServer.run(SourceFile:331)
at gp.run(SourceFile:573)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
at java.util.TreeMap.fixAfterInsertion(TreeMap.java:2074)
at java.util.TreeMap.put(TreeMap.java:559)
at java.util.TreeSet.add(TreeSet.java:238)
at iz.a(SourceFile:346)
at iz.a(SourceFile:318)
at aml.a(SourceFile:125)

-- Block being ticked --
Details:
Block type: ID #51 (tile.fire // aml)
Block data value: 12 / 0xC / 0b1100
Block location: World: (715,14,1506), Chunk: (at 11,0,2 in 44,94; contains blocks 704,0,1504 to 719,255,1519), Region: (1,2; contains chunks 32,64 to 63,95, blocks 512,0,1024 to 1023,255,1535)
Stacktrace:
at iz.a(SourceFile:430)
at iz.b(SourceFile:142)

-- Affected level --
Details:
Level name: New World
All players: 1 total; [jc['dnebones91'/331, l='New World', x=856.80, y=72.00, z=1554.42]]
Chunk stats: ServerChunkCache: 1078 Drop: 0
Level seed: 6895912182991687620
Level generator: ID 00 - default, ver 1. Features enabled: true
Level generator options:
Level spawn location: World: (212,64,252), Chunk: (at 4,4,12 in 13,15; contains blocks 208,0,240 to 223,255,255), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 347986 game time, 347986 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 49213 (now: false), thunder time: 6404 (now: true)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
at net.minecraft.server.MinecraftServer.r(SourceFile:454)
at net.minecraft.server.MinecraftServer.q(SourceFile:397)
at bjg.q(SourceFile:122)
at net.minecraft.server.MinecraftServer.run(SourceFile:331)
at gp.run(SourceFile:573)

-- System Details --
Details:
Minecraft Version: 1.5.2
Operating System: Mac OS X (x86_64) version 10.6.8
Java Version: 1.6.0_43, Apple Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
Memory: 82020368 bytes (78 MB) / 554369024 bytes (528 MB) up to 1069416448 bytes (1019 MB)
JVM Flags: 3 total; -Xbootclasspath/a:/System/Library/PrivateFrameworks/JavaApplicationLauncher.framework/Resources/LauncherSupport.jar -Xms512M -Xmx1024M
AABB Pool Size: 6504 (364224 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
Profiler Position: N/A (disabled)
Vec3 Pool Size: 1259 (70504 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Player Count: 1 / 8; [jc['dnebones91'/331, l='New World', x=856.80, y=72.00, z=1554.42]]
Type: Integrated Server (map_client.txt)
Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.

java.lang.NullPointerException
at java.util.TreeMap.fixAfterInsertion(TreeMap.java:2074)
at java.util.TreeMap.put(TreeMap.java:559)
at java.util.TreeSet.add(TreeSet.java:238)

That's not good... this is basically a java library class doing it's internal work (rebalancing a red black tree after the insertion).
This shouldn't crash..
You aren't running any mods at all, right? Zero, zip, nada? Sometimes they have had multi-threaded bugs.

I would lean against a bug in the java library, so... it's possible that Mojang is accessing this with unsafe multi-threading (a bug), but I would expect more people to have reported this. Another possibility is a bad memory chip.. Since it is easy enough to do I would suggest that you run your systems diagnostics and select a thorough memory test.

Okay thanks I ran the diagnostic and it turns out it is a memory problem. I had just recently put new memory in and I think it might just be in worng or one of the sticks is not good