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The only thing I had done, and I was able to duplicate the crash, was open a chest and hover over the map in my chest. I am running 12w36a. It was running fine yesterday, as that's when I had made said maps. I have one that is a 1:2, and another that is a 1:16. It happened when hovering over either one. I have the advanced(F3+H) tooltips enabled. It does NOT crash when I hover over it with the advanced tooltips DISABLED.
I would assume it's having trouble finding the specific item code to display properly from memory stored. When advanced tooltips are disabled, it shows "Map #3" and "Map #5." They are of two different maps. I was experimenting with the way the maps were created, and the map that is expanded to 1:16 is from a 1:8 before I updated to snapshot 12w36a, from 1.3.2. The 1:2 map was created while using 12w36a. Not sure if that would make a difference, but the conversion in data might have something wrong with it, from client to snapshot.

Hope that helps! If I think of something else relating to the situation, I'll come back and edit.




Minecraft has crashed!
----------------------

Minecraft has stopped running because it encountered a problem; Unexpected error
This error has been saved to C:\Users\Reactor\AppData\Roaming\.minecraft\crash-reports\crash-2012-09-10_17.42.30-client.txt for your convenience. Please include a copy of this file if you report this crash to anyone.



--- BEGIN ERROR REPORT 3f25ac18 --------
Generated 9/10/12 5:42 PM

- Minecraft Version: 12w36a
- Operating System: Windows 7 (x86) version 6.1
- Java Version: 1.7.0_06, Oracle Corporation
- Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
- Memory: 376546000 bytes (359 MB) / 519110656 bytes (495 MB) up to 1037959168 bytes (989 MB)
- JVM Flags: 2 total; -Xms512m -Xmx1024m
- LWJGL: 2.4.2
- OpenGL: Mobile Intel(R) 4 Series Express Chipset Family GL version 2.1.0 - Build 8.15.10.1883, Intel
- Is Modded: Probably not
- Type: Client
- Texture Pack: Default
- Profiler Position: N/A (disabled)
- World MpServer Entities: 11 total; [auv['Averagejez'/282, l='MpServer', x=500.25, y=71.62, z=59.17], om['Zombie'/348, l='MpServer', x=491.01, y=25.00, z=68.53], om['Zombie'/355, l='MpServer', x=506.41, y=45.00, z=80.00], oj['Skeleton'/391, l='MpServer', x=526.22, y=21.00, z=19.96], nc['Sheep'/306, l='MpServer', x=449.06, y=68.00, z=45.88], nc['Sheep'/343, l='MpServer', x=499.38, y=69.00, z=8.42], nc['Sheep'/314, l='MpServer', x=451.38, y=71.00, z=-12.87], om['Zombie'/408, l='MpServer', x=562.56, y=31.12, z=20.01], nz['Creeper'/419, l='MpServer', x=575.50, y=53.00, z=23.86], nc['Sheep'/307, l='MpServer', x=441.76, y=70.00, z=80.87], om['Zombie'/358, l='MpServer', x=521.07, y=20.00, z=-3.56]]
- World MpServer Players: 1 total; [auv['Averagejez'/282, l='MpServer', x=500.25, y=71.62, z=59.17]]
- World MpServer Chunk Stats: MultiplayerChunkCache: 441
- Forced Entities: 11 total; [nc['Sheep'/343, l='MpServer', x=499.38, y=69.00, z=8.42], auv['Averagejez'/282, l='MpServer', x=500.25, y=71.62, z=59.17], om['Zombie'/358, l='MpServer', x=521.07, y=20.00, z=-3.56], nc['Sheep'/307, l='MpServer', x=441.76, y=70.00, z=80.87], om['Zombie'/408, l='MpServer', x=562.56, y=31.12, z=20.01], nc['Sheep'/306, l='MpServer', x=449.06, y=68.00, z=45.88], om['Zombie'/355, l='MpServer', x=506.41, y=45.00, z=80.00], nz['Creeper'/419, l='MpServer', x=575.50, y=53.00, z=23.86], nc['Sheep'/314, l='MpServer', x=451.38, y=71.00, z=-12.87], om['Zombie'/348, l='MpServer', x=491.01, y=25.00, z=68.53], oj['Skeleton'/391, l='MpServer', x=526.22, y=21.00, z=19.96]]
- Retry Entities: 0 total; []

java.lang.NullPointerException
at se.a(SourceFile:250)
at sc.a(SourceFile:358)
at arn.a(SourceFile:125)
at arn.a(SourceFile:107)
at awm.b(SourceFile:755)
at net.minecraft.client.Minecraft.J(SourceFile:630)
at net.minecraft.client.Minecraft.run(SourceFile:558)
at java.lang.Thread.run(Unknown Source)
--- END ERROR REPORT 7f9419e ----------

I am having the same crash in Snapshot 12w37a, both in worlds created in this snapshot and in older worlds I pulled up to test it. If I turn the enhanced tool tip descriptions off before hovering over a map in my chest it doesn't crash, but with F3 + H enabled it crashes. It also doesn't crash when I first put the map in the chest, only after I quit the world then reload it and visit the chest. If I put it back into my inventory with F3 + H toggled off then turn it on, I can see the enhanced description again. I also managed to get this crash with a written book, so it is that extra value in the item that the code is freaking out on.