Put the summary of the bug you're having here
What I expected to happen was that I should be able to join a server and play with one of my best friends.
*What actually happened was when the server loads up, I crash
Steps to Reproduce:
1. Launch Minecraft using 1.7.9
2. Join a server called `pottercraft' the ip is pottercraft.simpleno.de
3. Your Game should crash, well mine does.
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Incomplete without a crash report from ([minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/finding-minecraft-data-folder]
). Please attach it so that we can diagnose your issue.
Most likely a duplicate of MC-38527
Besides that: Your version of Minecraft is no longer supported. We are currently only accepting bugs found in the official release 1.8 and later.

This is the one, (I think)

Yes, this is MC-38527. See there for instructions.