Put the summary of the bug you're having here
What I expected to happen was...:
to open it without any items
What actually happened was...:
it crashed
Steps to Reproduce:
1. use NBTExplorer
2. delete the inventory
3. open the world
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[media]

Incomplete without crash report ([minecraft|http://hopper.minecraft.net/help/finding-minecraft-data-folder]/crash-reports/crash-<DATE>-client.txt
). Please attach it so that we can diagnose your issue.