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This has never happened before. I have a good computer, little to no lag, etc. Then, when a creeper explodes, I crash.

--- BEGIN ERROR REPORT 4396ecea --------
Full report at:
C:\Users\William\Desktop\FolderOfFolders\Games\MultiMC\instances\1.5.1\minecraft\crash-reports\crash-2013-05-01_02.39.02-server.txt
Please show that file to Mojang, NOT just this screen!
Generated 5/1/13 2:39 AM
-- Head --
Stacktrace:
at net.minecraft.world.Explosion.func_77279_a(Explosion.java:225)
at net.minecraft.world.WorldServer.func_72885_a(WorldServer.java:1000)
at net.minecraft.world.World.func_72876_a(World.java:2702)
at net.minecraft.entity.monster.EntityCreeper.func_70071_h_(SourceFile:103)
at net.minecraft.world.World.func_72866_a(World.java:2336)
at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:717)
at net.minecraft.world.World.func_72870_g(World.java:2298)
-- Entity being ticked --
Details:
Entity Type: Creeper (net.minecraft.entity.monster.EntityCreeper)
Entity ID: 39873
Entity Name: Creeper
Entity's Exact location: -206.77, 77.00, 52.97
Entity's Block location: World: (-207,77,52), Chunk: (at 1,4,4 in -13,3; contains blocks -208,0,48 to -193,255,63), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Entity's Momentum: 0.00, -0.08, 0.00
Stacktrace:
at net.minecraft.world.World.func_72939_s(World.java:2144)
at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:546)
-- Affected level --
Details:
Level name: New World
All players: 1 total; [EntityPlayerMP['williewest'/231, l='New World', x=-202.16, y=76.00, z=57.21]]
Chunk stats: ServerChunkCache: 709 Drop: 0
Level seed: 1780861952535697744
Level generator: ID 00 - default, ver 1. Features enabled: true
Level generator options:
Level spawn location: World: (-208,64,224), Chunk: (at 0,4,0 in -13,14; contains blocks -208,0,224 to -193,255,239), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Level time: 18747 game time, 18747 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 103418 (now: false), thunder time: 152565 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Stacktrace:
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:651)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:570)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:127)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:468)
at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:573)
-- System Details --
Details:
Minecraft Version: 1.5.1
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_17, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 206410288 bytes (196 MB) / 525664256 bytes (501 MB) up to 954466304 bytes (910 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 4677 (261912 bytes; 0 MB) allocated, 2870 (160720 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 1, tallocated: 63
FML: MCP v7.44 FML v5.1.43.679 Minecraft Forge 7.7.2.679 13 mods loaded, 13 mods active
mcp{7.44} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML{5.1.43.679} [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge{7.7.2.679} [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CodeChickenCore{0.8.5.6} [CodeChicken Core] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
NotEnoughItems{1.5.2.9} [Not Enough Items] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Familiars_API{1.5.1} [Familiars API] (Familiars_API_1.5.1a.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
mod_ReiMinimap{v3.3_04 [1.5.1]} [mod_ReiMinimap] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Backpack{1.7.8} [Backpack] (backpack-1.7.8-1.5.1(1).zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CJB|API{1.5.1.1} [CJB Mods Rebirth] (CJB-API-1.5.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CJB|XRay{1.5.1.1} [CJB X-Ray Mod] (CJB-XRay-Mod-1.5.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Familiars_DefaultMobPack{1.5.1} [DefaultMobPack] (Familiars_DefaultMobPack_1.5.1a.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Familiars_ExtendedFamPack{1.5.1} [ExtendedFamPack] (Familiars_ExtendedFamPack_1.5.1a.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
PetBat{1.1.8} [Pet Bat] (PetBat_1.5.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Profiler Position: N/A (disabled)
Vec3 Pool Size: 1442 (80752 bytes; 0 MB) allocated, 1442 (80752 bytes; 0 MB) used
Player Count: 1 / 8; [EntityPlayerMP['williewest'/231, l='New World', x=-202.16, y=76.00, z=57.21]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'
java.lang.NoSuchMethodError: net.minecraft.block.Block.onBlockExploded(Lnet/minecraft/world/World;IIILnet/minecraft/world/Explosion;)V
at net.minecraft.world.Explosion.func_77279_a(Explosion.java:225)
at net.minecraft.world.WorldServer.func_72885_a(WorldServer.java:1000)
at net.minecraft.world.World.func_72876_a(World.java:2702)
at net.minecraft.entity.monster.EntityCreeper.func_70071_h_(SourceFile:103)
at net.minecraft.world.World.func_72866_a(World.java:2336)
at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:717)
at net.minecraft.world.World.func_72870_g(World.java:2298)
at net.minecraft.world.World.func_72939_s(World.java:2144)
at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:546)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:651)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:570)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:127)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:468)
at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:573)
--- END ERROR REPORT e0415432 ----------

I did a test. No matter what world I'm on, when a creeper explodes, that world is no longer playable.

Okay, so, it's CJB's Xray Mod. With Optifine, all it seems to do is make it so I can see underwater. Without Optifine, it works perfectly, but, creepers crash the game.

Edit: I've managed to get Optifine and Xray to work together but creepers still crash the game.

In the end, the creeper bug seemed to fix itself and I sacrificed Optifine.

Edit: I still have no idea what the problem was.