An NPE is thrown for signs with certain text on them. I have uploaded 3 different files: The code to a command used for testing this in a plugin, the screenshot of the offending sign and the relevant log of the bukkit minecraft server.

I have also created a gist showing the diff of MapView.java for debugging purposes: https://gist.github.com/AlphaBlend/483f0089dc533c6521916623a6895998/revisions

The logs in log.txt are based on the modifications made in MapView.java. The offending line of code is:

result += chars.get(text.charAt(i)).getWidth();

I have also created a World Edit schematic of the sign. The JSON for the text of the sign was saved as: http://pastebin.com/99WmyDCe (I don't think JIRA would like JSON in code tags)

The text entered on the sign is:

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
..........................................A
............43564343434
4354354.........zzZZ!!!

This issue might be a vanilla issue, but since this involved bukkit code, I figure I'd at least try here.