Minecraft crashed after rapid map expanding

This ticket is invalid as it relates to a modified or 3rd party client, server, or launcher.

• Any non-standard client/server/launcher build needs to be taken up with the appropriate team, not Mojang.
• Any plugin issues need to be addressed to the creator of the plugin or resource pack.
• This site is for addressing issues related to the base unmodded Minecraft; Bukkit, Forge, Optifine, or any other modded system invalidates your ticket, unless it can be shown to happen in Vanilla.
• Additionally, if you have problems on large-scale modded servers, please report it to their site. It's probably not a bug in Vanilla Minecraft.

  ---

Minecraft crashed after i have crafted a bigger map with an already existing map rapidly.

How to reproduce:
1. Get yourself a stack of paper

2. Craft a compass

3. Craft a map

4. Expand the map rapidly

If it helps, i have attached the crash report.

edit: Still happening in 1.4.5