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My game crashes everytime I try to open my 3 year-old singleplayer world. This started happening after I entered a Nether portal that took me to my packed ice farm in the overworld. Since the game crashes upon loading, I can't play it anymore.

I get the same crash report every time:

---- Minecraft Crash Report -------- Minecraft Crash Report ----// Oh - I know what I did wrong!
Time: 11/01/18 12:09Description: Exception ticking world
g: Non [a-z0-9/._-] character in path of location: minecraft:Zombie

at ns.<init>(SourceFile:36)

at ns.<init>(SourceFile:41)

at aru.g(SourceFile:42)

at aru.b(SourceFile:185)

at bbf.a(SourceFile:86)

at bbf.Q_(SourceFile:104)

at jm.<init>(SourceFile:52)

at rt.b(SourceFile:105)

at ru.c(SourceFile:165)

at ro.d(SourceFile:219)

at net.minecraft.server.MinecraftServer.w(SourceFile:673)

at net.minecraft.server.MinecraftServer.v(SourceFile:606)

at cmj.v(SourceFile:152)

at net.minecraft.server.MinecraftServer.run(SourceFile:511)

at java.lang.Thread.run(Thread.java:745)

A detailed walkthrough of the error, its code path and all known details is as follows:---------------------------------------------------------------------------------------
-- Head --Thread: Server threadStacktrace: at ns.<init>(SourceFile:36) at ns.<init>(SourceFile:41) at aru.g(SourceFile:42) at aru.b(SourceFile:185) at bbf.a(SourceFile:86) at bbf.Q_(SourceFile:104) at jm.<init>(SourceFile:52) at rt.b(SourceFile:105) at ru.c(SourceFile:165) at ro.d(SourceFile:219)
-- Affected level --Details: Level name: . All players: 1 total; [rq['Sassy_Sam'/315, l='.', x=-2527,50, y=72,00, z=-2686,37]] Chunk stats: ServerChunkCache: 674 Drop: 0 Level seed: -5559834894942435694 Level generator: ID 08 - default_1_1, ver 0. Features enabled: true Level generator options: Level spawn location: World: (136,64,256), Chunk: (at 8,4,0 in 8,16; contains blocks 128,0,256 to 143,255,271), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511) Level time: 18615598 game time, 20859930 day time Level dimension: 0 Level storage version: 0x04ABD - Anvil Level weather: Rain time: 78113 (now: false), thunder time: 74165 (now: false) Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: falseStacktrace: at net.minecraft.server.MinecraftServer.w(SourceFile:673) at net.minecraft.server.MinecraftServer.v(SourceFile:606) at cmj.v(SourceFile:152) at net.minecraft.server.MinecraftServer.run(SourceFile:511) at java.lang.Thread.run(Thread.java:745)
-- System Details --Details: Minecraft Version: 18w02a Operating System: Windows 10 (amd64) version 10.0 Java Version: 1.8.0_65, Oracle Corporation Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation Memory: 137478000 bytes (131 MB) / 364625920 bytes (347 MB) up to 4281597952 bytes (4083 MB) JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx4G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94 Profiler Position: N/A (disabled) Player Count: 1 / 8; [rq['Sassy_Sam'/315, l='.', x=-2527,50, y=72,00, z=-2686,37]] Data Packs: vanilla Type: Integrated Server (map_client.txt) Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.

I'm very frustrated and saddened.

Don't play snapshots, they can corrupt your world, stick to full releases.