If TNT blows up while you're in a locked chest, you crash.
Details:
Minecraft Version: 13w01a
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_09, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 230212464 bytes (219 MB) / 519110656 bytes (495 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 773 (43288 bytes; 0 MB) allocated, 727 (40712 bytes; 0 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Profiler Position: N/A (disabled)
Vec3 Pool Size: 4513 (252728 bytes; 0 MB) allocated, 272 (15232 bytes; 0 MB) used
Player Count: 1 / 8; [iq['hockeypeg18'/53, l='Redstone', x=350.05, y=6.52, z=1853.82]]
Type: Integrated Server (map_client.txt)
Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.

java.lang.NullPointerException
at anu.f(SourceFile:247)
at rx.b(SourceFile:68)
at iq.k(SourceFile:482)
at iq.i(SourceFile:467)
at qx.j_(SourceFile:204)
at iq.g(SourceFile:175)
at iv.a(SourceFile:199)
at eb.a(SourceFile:136)
at cf.b(SourceFile:55)
at iv.d(SourceFile:57)
at iw.b(SourceFile:39)
at beq.b(SourceFile:84)
at net.minecraft.server.MinecraftServer.r(SourceFile:762)
at net.minecraft.server.MinecraftServer.q(SourceFile:679)
at ben.q(SourceFile:117)
at net.minecraft.server.MinecraftServer.run(SourceFile:613)
at fy.run(SourceFile:849)
— END ERROR REPORT dc9d8627 ----------