As I said, my console is getting spammed with things like: "[10:18:47 INFO]: Client> [10:18:47] [Client thread/ERROR]: Item entity 32747 has no item?!".
The game will start lagging and stop responding every few seconds (or if I open my inventory), and will eventually crash. This happened in multiplayer too and crashed the whole server for some reason. The server had plugins, which I thought were the problem, but when I tested the snapshot, it still kept happening! I don't know if it helps, but I'll put screenshots of the console in here anyway.
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Appears it may be a corrupted world, does this happen on other worlds?
Please provide a copy/paste of the full text of the development console not an image.

Happens when loading a world in 14wXX and then in 1.7.x