Can't load my world

After the 1.4.2 update, the game can't load one of my saves. In the console, I have that :

Wrong location! og['Bat'/27, l='Mouâhahahahahââââârgh... *mort*', x=-8,25, y=13,12, z=159,25]
java.lang.Exception: Stack trace
at java.lang.Thread.dumpStack(Thread.java:1342)
at za.a(SourceFile:508)
at zn.a(SourceFile:277)
at zn.a(SourceFile:87)
at zn.a(SourceFile:75)
at id.f(SourceFile:111)
at id.c(SourceFile:73)
at net.minecraft.server.MinecraftServer.e(SourceFile:489)
at bcb.a(SourceFile:83)
at bcb.c(SourceFile:99)
at net.minecraft.server.MinecraftServer.run(SourceFile:570)
at fp.run(SourceFile:818)

(thousands of times)

...then I return in the main menu.