*What I expected to happen was the game would normally load up some chunks.

*What actually happened was the game crashed

I can't put steps to reproduce because I don't know what caused it.

Also, in my map there are different areas you can teleport to and I think I built the one I was generating new chunks for in 1.8 and I think I built the next one (All the areas are in a line) in 1.7.

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

Time: 10/13/14 3:16 PM
Description: Exception ticking world

java.lang.NullPointerException: Exception ticking world
at bmv.a(SourceFile:40)
at bmm.a(SourceFile:93)
at bgq.a(SourceFile:152)
at qs.a(SourceFile:174)
at bfh.a(SourceFile:870)
at qs.c(SourceFile:104)
at qs.d(SourceFile:116)
at aqu.a(SourceFile:276)
at qt.h(SourceFile:327)
at qt.c(SourceFile:202)
at net.minecraft.server.MinecraftServer.z(SourceFile:599)
at net.minecraft.server.MinecraftServer.y(SourceFile:531)
at cyk.y(SourceFile:155)
at net.minecraft.server.MinecraftServer.run(SourceFile:447)
at java.lang.Thread.run(Unknown Source)

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

– Head –
Stacktrace:
at bmv.a(SourceFile:40)
at bmm.a(SourceFile:93)
at bgq.a(SourceFile:152)
at qs.a(SourceFile:174)
at bfh.a(SourceFile:870)
at qs.c(SourceFile:104)
at qs.d(SourceFile:116)
at aqu.a(SourceFile:276)
at qt.h(SourceFile:327)
at qt.c(SourceFile:202)

– Affected level –
Details:
Level name: Statues Map (Use the snapshot)
All players: 1 total; [qw['jawsoflife353'/29940, l='Statues Map (Use the snapshot)', x=3104.25, y=124.60, z=-243.36]]
Chunk stats: ServerChunkCache: 976 Drop: 0
Level seed: -381977798
Level generator: ID 01 - flat, ver 0. Features enabled: true
Level generator options: 2;7,59x1,3x3,2;1;stronghold,biome_1,village,decoration,dungeon,lake,mineshaft,lava_lake
Level spawn location: -33.00,4.00,-239.00 - World: (-33,4,-239), Chunk: (at 15,0,1 in -3,-15; contains blocks -48,0,-240 to -33,255,-225), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
Level time: 2738358 game time, 0 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 1 (now: false), thunder time: 1 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
at net.minecraft.server.MinecraftServer.z(SourceFile:599)
at net.minecraft.server.MinecraftServer.y(SourceFile:531)
at cyk.y(SourceFile:155)
at net.minecraft.server.MinecraftServer.run(SourceFile:447)
at java.lang.Thread.run(Unknown Source)

– System Details –
Details:
Minecraft Version: 1.8
Operating System: Windows 8.1 (x86) version 6.3
Java Version: 1.7.0_67, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 236332640 bytes (225 MB) / 523501568 bytes (499 MB) up to 523501568 bytes (499 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Profiler Position: N/A (disabled)
Player Count: 1 / 8; [qw['jawsoflife353'/29940, l='Statues Map (Use the snapshot)', x=3104.25, y=124.60, z=-243.36]]
Type: Integrated Server (map_client.txt)
Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.