Sometimes, whan I join a server, (Now, this is server specific, it might not occur on other servers while occurring on a certain server) I can't see the scoreboard. If the objective that currently has any display gets updated (If the values get updated, this will not happen), it will crash the client. Rejoining or restarting does not help. The only way to get rid of this is by waiting. It might work the next day. I have not had this happen in singleplayer, but I don't play so much of it.
Here is the crash report: http://pastebin.com/aEzQ1ZEL
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Update: Happens also with the newest Java version, included full text file.
Note:
Description: Exception in world tick
java.lang.NullPointerException
at arj.k(SourceFile:133)
at bdl.a(SourceFile:1086)
at fc.a(SourceFile:43)
at ci.b(SourceFile:350)
at bdl.d(SourceFile:95)
at bdt.b(SourceFile:58)
Your Java is still outdated.
Is it? How can I then get the newest version? Do you mean the 64 bit version... I'll try that when I have time.
Is this still a concern in the current Minecraft version? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.

No answer, assuming no longer an issue.
Haven't had it reproduce yet, but I will report it, if this happens.
3 things:
1.
Please do not mark versions as affected you haven't tested yet.
2. A full error report has been saved to C:\Users\Roope S\AppData\Roaming\.minecraft\crash-reports\crash-2013-04-30_19.50.31-client.txt - Please include a copy of that file (Not this screen!) if you report this crash to anyone; without it, they will not be able to help fix the crash 😞
3. Your Java version is out of date. Please update your Java to the latest version: http://www.java.com/en/download/. Keep in mind that when using a 32-bit browser on a 64-bit OS the automatic version detection will only show the 32-bit version of Java, the 64-bit version needs to be downloaded manually: http://www.java.com/en/download/manual.jsp.
Please report if the issue persists with the latest Java version.